View Full Version : Differentials - ALL you need to know


5spdvl
30-03-08, 21:59
Anything you want to know about Borg Warner 78 Series diffs, can be found here.


Description
VLTs and VL V8s were all built with 4 pinion 28 spline centres, with LSD as an option (noted by a brown filler plug), running single piston disc brakes, upon live axle (semi-floating) differential (non-IRS) housings. Otherwise, naturally aspirated VLs were built with 2 pinion 25 spline open wheel differentials (noted by a black filler plug; unless optioned [with LSD] otherwise), running drum brakes (unless optioned otherwise; see below). The diff housing measures 1400mm in width, axle flange to axle flange (sedan and wagon).

The type of centre fitted can also be determined by the diff tag (where present), secured under one of the cover bolts. See here (http://www.calaisturbo.com.au/showthread.php?t=21047).

Non-lsd (2 pinion):LSD (4 pinion):
http://i234.photobucket.com/albums/ee47/Sennator30/Diff.jpghttp://i234.photobucket.com/albums/ee47/Sennator30/lsd.jpg

Video: How a differential works (http://www.spikedhumor.com/articles/189471/How-a-Differential-works.html)


Options
Across the VL range, LSDs and disc brakes were optional (not restricted to being present only on turbo or V8 models).
For example:
SL/Exec - 3.45 gears, 2 pinion center, 25 spline axles, drum brakes, possible LSD Optional
Berlina - 3.45 gears, 2 pinion center, 25 spline axles, drum brakes, LSD Optional, Disc brakes optional
Calais - 3.45 gears, 2 pinion center, 25 spline axles, disc brakes, LSD Optional
V8 VL's were able to optioned with the same 4 pinion 28 spline LSD centres, running the same disc brakes, however they were equipped with 3.08 ratio gears to improve fuel economy (it was also possible to option these diffs with the higher ratio 3.45 gears). The handbrake cable differs between disc brake and drum brake diffs.


Changing internals
Changing a pinion requires tools to measure backlash and gear clearance - without it, the differential wears excessively, and will shorten the life/performance of your diff. A pinion is removed by unbolting the tail-shaft, leaving the handbrake on/keeping the rear wheels on the ground, and undoing the nut on the front of the diff (previously hidden by the tail-shaft flange). The nut should be marked before it is undone to ensure the correct torque and clearances are maintained (this is not ALL of the necessary measurements/torques required).

Changing the centre is a simple operation, however sometimes the centre can be difficult to remove from the housing (which is where the chain/bottle jack method comes into play, bending the housing slightly). When re-installing a differential centre, the original shims must be installed them same way, otherwise excessive wear will result.

It should be noted that 25 spline centres use different bearing cups than the larger 28 spline open wheeler and LSD centres, and you cannot re use your original 25 spline bearing cups when converting to a 28 spline BW78 centre. The part number for a single bearing cup is LM102911; you'll need two (one for each carrier bearing). They are worth $8.80 from a bearing shop last time I bought one.


Housing/Oil Replacement
VL diff housings do not have a drain plug. Replacement of the oil is achieved by removing the back cover, draining oil, replacing gasket and refitting cover. Drum brake axles have different seals and bearings to discs brake axles. Diff housings are different between sedans and wagons; being that the wagons have differing mounting points for the extra load a wagon can take. Meaning your wagon must take a wagon diff, and your sedan a sedan diff. The axles are the same between wagon and sedan housings.


Determining LSD status
A differential can be tested to determine whether it is an LSD or not in-car by raising the rear end, and rotating one wheel. If they both go in the same direction, it is an LSD. Otherwise, it can be removed from the housing and checked for the presence of a second row of bolts around the ring gear bolts; this indicates it is an LSD centre. This check can also be performed by removing the diff cover and observing the presence of the second row of bolts (without removing the centre from the housing).


Spools
An open wheel centre (non-LSD "Single Spinner" centre) can be modified to dual-wheel spinning status by installing a "spool". This basically locks the centre of the differential to the rotation of the ring gear, and will cause both wheels to always drive. As there is no limited slip action, it will be a rougher ride for street driving on corners and roundabouts, and more stressful to your axles, and wear your rear tyres faster. They are illegal for street use. A tell tale sign is the "scrape-scrape-scrape" sound when a car that has one fitted is performing low speed manoeuvres.


Borg Warner 78 Series in Other Cars
Borg Warner 78 Series differential centres are found in VL-VS Commodores, R31 Nissan Skylines and Pintara's, and XC-XG Falcons. LSD centres were found in VLT's/VLCT's/V8 VL's (where optioned), R31 Skyline Silhouettes, VN-VS SS/V8/S-pak's (where optioned), and XC-XG S-pak and XR6 and XR8 Falcons. Their ring gear and pinions are all interchangeable. Brand new BW centres can be bought without gears from eBay for $275, 28 spline spools for $89.99, new billet axles for $660, and gears vary. Ratios include 3.08 (VL V8, VN-VS), 3.45 (VL, VLT, VLCT), 3.7 (R31 manual), 3.89, 3.9 (R31 auto), and 4.11 (Pintara). The higher the gear ratio, the more the wheels will rotate in relation to the tail-shaft. 28 spline axles are present in any BW diff using a 28 spline carrier in the centre (VLT/VLCT with 4 pinion LSD, VN-VS [all centres] ); however 28 spline axles from VN-VS may not be used in a VL diff housing (they are too long). Similarly, a VN-VS diff housing (excluding IRS; see below) cannot be bolted onto a VL chassis (they are too wide).

Ring gear and pinion:
http://i234.photobucket.com/albums/ee47/Sennator30/ringpinion.jpg


Top Speed/RPM Calculators

To determine the maximum top speed of your car, click on the first link below. You'll need to know your car's maximum rpm (6500rpm for a stock ECU'd VL/VLT), rear tyre width in millimetres (ie: 225, 235, etc), diff gear ratio, and your highest gear's ratio (ie: R33 five speed fifth gear 0.813:1). The second is a similar calculator, with some preset values for different diff gear ratios. It also gives you your results in MPH. I find the first the easiest to use.

Top speed calculator (Km/h) (http://www.csgnetwork.com/speedcalc.html)
Top speed calculator (MPH) (http://www.csgnetwork.com/rearendgearcalc.html)

Here is another more complicated calculator:
Tyre size/diameter/speed calculator (http://pw1.netcom.com/~sgalaba/tiresize.htm#TireSize)

And here are some links to listings of common transmission options final gear ratios.

MX7 VLT five speed manual (http://www.skylinesaustralia.com/forums/index.php?showtopic=12301&view=findpost&p=222379)
MF5 VL N/A five speed manual
M78 VL V8 five speed manual (Walkinshaw only)
Skyline R32 GTS-t five speed manual (RWD) (http://www.skylinesdownunder.com/index.php?option=com_content&task=view&id=79&Itemid=101)
Skyline R32 N/A five speed manual (RWD) (http://www.skylinesdownunder.com/index.php?option=com_content&task=view&id=79&Itemid=101)
Skyline R32 GT-R five speed manual (AWD) (http://www.skylinesdownunder.com/index.php?option=com_content&task=view&id=79&Itemid=101)
FS5R30A Skyline R33 N/A five speed manual (RWD) (http://www.skylinesdownunder.com/index.php?option=com_content&task=view&id=79&Itemid=101)
FS5W7 Skyline R33 GTS-t five speed manual (RWD) (http://www.skylinesaustralia.com/forums/index.php?s=&showtopic=12301&view=findpost&p=224264)
MS1 VLT four speed auto
ML4 VLT N/A four speed auto
M40 Trimatic VL V8 three speed auto
Skyline R32 RB20E N/A auto (http://www.skylinesdownunder.com/index.php?option=com_content&task=view&id=79&Itemid=101)
Skyline R32 RB20DE N/A auto (http://www.skylinesdownunder.com/index.php?option=com_content&task=view&id=79&Itemid=101)
Skyline R33 RB25DE N/A auto (http://www.skylinesdownunder.com/index.php?option=com_content&task=view&id=79&Itemid=101)
Powerglide two speed auto


Upgrades
Whilst the BW78 28 spline 4 pinion LSD is a good unit, and has been used reliably to run into the 10s on drag focused cars, there is always something better available. Being a clutch type LSD, it will eventually wear out (especially if you are buying it second hand...making it 22 years old). Your options are varied:

-Kaaz 28 Spline 2 Way LSD (http://www.kaazusa.com/products_lsd.html) (multi plate clutch-type LSD [locks both wheels during acceleration and deceleration]; part number DAG3820)

http://i234.photobucket.com/albums/ee47/Sennator30/Untitled-7.png

Best price I have found is from business trader Slide, over on SAU - $1490 delivered with 2L of Kaaz diff oil:
Slide, of SAU (http://www.slidingperformance.com/store/index.php?page=viewproduct&categoryid=6&manufacturersid=50&productid=74) (the original thread is MIA from SAU, so I have redirected you to his personal business page. DAG3820 is not listed, but he can get it for you)


-Harrop Detroit TrueTrac LSD (http://www.harrop.com.au/drive_detail.php?prod=99-TTRC9837-00) (Helical gear type LSD; part number varies, see below)
http://i234.photobucket.com/albums/ee47/Sennator30/Untitled2.png

Highly recommended, as they do not have wearing clutch/clutch plates like other LSDs. Available right here on CT from our very own Missile Performance (http://www.calaisturbo.com.au/showthread.php?t=195562)! Harrop now makes 28 and 31 spline varieties from VL to VT series 1, and VT series 2 to VZ.



Miscellaneous
When removing a ring gear from a centre, the bolts are left hand thread.

IRS setups cannot be directly bolted onto a VL chassis (without custom work). There were a handful (and I do mean handful, probably less than five) of Directors that were fitted with IRS. The only mention I have seen of IRS on a VL is as hybrid R32/Z32 IRS, found here (http://www.driftshop.com.au/twinvl/nissanirs.html). Thanks to 87calais for the reference.

A picture of an R33 Skyline IRS differential set up. Notice the completey different structure and flexible driveshafts, not present in the VL BW78 diff:

http://www.driftshop.com.au/twinvl/pics/IRSabove.jpg

Watts Linkages, invented by James Watts, are a live axle set up used by the V8 Supercars. It does away with the panhard rod, and makes use of a central bell crank, mounted on the diff housing, and two (adjustable) arms off the bell crank to the chassis. This can also be reversed, where the bell crank is mounted to the chassis, and the two bell crank arms are attached to the diff (as opposed to the chassis). This type of differential set up allows the diff to stay centered below the chassis, despite a change in ride hide due to motion of cornering or bumps. This is great for maintaining tyre/rim to wheel arch clearances in very low track cars. An excellent example of the first type (diff mounted bell crank) is found here (http://www.webrodder.com/article.php?AID=366&SID=60).

Here is a visual representation of the basic principle of a Watts Link. The red dot is the centre of the rotating bell crank, and the diff would sit horizontally through it.

http://upload.wikimedia.org/wikipedia/commons/9/93/Watts_linkage.gif

And, more realistically:

http://www.griggsracing.com/images/GR40WattsBig.jpg


Feel free to make suggestions or corrections, and I shall add/change them. :cool:

giantbrandon
30-03-08, 22:17
doesnr the "78 series" stand for 7.8 inch crown wheel

5spdvl
30-03-08, 22:27
I'm not sure giantbrandon, but that sounds reasonable to me. I actually thought it meant they were first produced in 1978.

MARMO.
30-03-08, 23:25
the non-lsd optioned turbo/v8 still had 28spline axels i pretty certain. just an open wheel center.

other then that some really helpfull info for ppl who dont know :D

also like to add, calais (nonturbo) came with 25spline disc diffs with lsd being an option, but still retaining 25splines when optioned with lsd.

5spdvl
30-03-08, 23:33
also like to add, calais (nonturbo) came with 25spline disc diffs with lsd being an option, but still retaining 25splines when optioned with lsd.

Really? So the 28 spline axles were designated for the more torquey turbo model...

MARMO.
30-03-08, 23:45
as far as i know,

vlt/v8 28spline disc with lsd option
vl na sl/exec/berlina 25spline drum with lsd option (but still 25spline with lsd optioned)
vl na calais 25spline disc with lsd option (but once again still only 25spline when lsd optioned


only thing im not sure of is if the sl/exec/berlina was optioned with lsd, is if it still retianed the drum breaks or got discs

GOT_POWR
31-03-08, 06:39
My calais turbo had a single spinner from the factory with 28 spline axles

5spdvl
31-03-08, 10:12
My calais turbo had a single spinner from the factory with 28 spline axles

I would say there would be some unusual examples out there as well. No way to really tell, so this is the general consensus on Borgies.

Steve
31-03-08, 12:00
VLT - 3.45 gears, 4 pinion center, 28 spline axles, disc brakes - LSD Optional
V8 - 3.08 gears, 4 pinion center, 28 spline axles, disc brakes - LSD Optional, 3.45 gears Optional

NA's :
SL/Exec - 3.45 gears, 2 pinion center, 25 spline axles, drum brakes, possible LSD Optional
Berlina - 3.45 gears, 2 pinion center, 25 spline axles, drum brakes, LSD Optional, Disc brakes optional
Calais - 3.45 gears, 2 pinion center, 25 spline axles, disc brakes, LSD Optional

5spdvl
31-03-08, 14:44
Incorporated. Thanks Steve. :cool:

Mattuz
31-03-08, 21:24
so if i want to know if my calais (non turbo) has an LSD from factory (which i doubt) i just raise the rear end and spin a wheel and they should both spin at the same time?

5spdvl
31-03-08, 22:26
Thats how you do it. :)

Alternatively, you can remove the diff cover, and check if there are two sets of ring gear bolts (which indicate the presence of an LSD hemisphere; guarantees, as a worn diff can perform erratically).

Steve
31-03-08, 23:11
...or the diff will have a tag on one of the bolts holding the rear cover on
theres another tech thread that shows what the numbers mean

this one --> http://www.calaisturbo.com.au/showthread.php?t=21047

5spdvl
01-04-08, 14:03
Uh huh, included. :cool:

BOB18U
02-04-08, 03:18
Question?
Can a 25 spline single wheel center take a 28 spline spool?

giantbrandon
02-04-08, 08:15
Question?
Can a 25 spline single wheel center take a 28 spline spool?
no they are different

Psi_Wagon
02-04-08, 08:30
are you going to update your fisrt post? as theres still some wrong info there...

eg;

ALL VLT and V8 VL's came factory 4 pinions 28 Spline and had the Option for LSD.

the quote from steve need to mention that they are N/A 6cyl ONLY.

ALL VLT and V8 VL's had disk brakes, there was no option there.

and just to clear up what you said about the wagon diff, its not different so it can take a larger load, its different because the shocks on a wagon bolt to the car in a different position to the sedan.

NZ VL com
03-05-08, 13:35
try this. i came accross a VL V8 wagon diff. 4.11 gears.non lsd.disc brake.25 spline. I told the guy theres no way that is a v8 diff and he said"its the 2nd V8 wagon hes wrecked and they both had as above"weird i thought only 2.0 manual's had 4.11 and whats with the 25 spline? i was pissed off i had bought the diff nearly but no thanks.he went on to say his old man works at holden dealership and he couldn't find any record of VL V8 having 4.11 gears, to many things didnt add up but strange how 2 random diff were exactly the same.
correction the XA XB also had BW 78 diffs so do valiant some with lsd

Psi_Wagon
03-05-08, 13:55
thats very strange, but as you said way off the truth!

5spdvl
03-05-08, 23:15
I should also point out guy this thread is for Australian released cars; I've no real knowledge of New Zeaand stuff.

NZ VL com
05-05-08, 16:51
had a VL with 3.36 diff gears..... small sals with 202 auto aus made

5spdvl
05-05-08, 17:44
AFAIK Sailbury diffs were used in VKs, and never used in VLs.

I suppose its possible that the odd one could have a Salisbury, although its never mentioned in a manual. Maybe someone put the Salisbury in after factory?

NZ VL com
05-05-08, 20:58
afaik?the VL was set up in the V8 style battery on left etc.....difinately factory 202 with sals diff

Psi_Wagon
05-05-08, 21:14
wtf^^ ? it wasnt a VL, VK yes...... even VK with a VL front, theres a few of them around. noway could u get a VL with a 202 registerd

boosted_wagon
05-05-08, 21:31
Borg Warner Were First Released In The Vk Model Towards The End Of There Production Maily In The Efi 6cyl Models But Only In The 2 Pinion 25 Spline Also Au Ford Still Run The 78 Series Centres

5spdvl
05-05-08, 22:42
afaik?the VL was set up in the V8 style battery on left etc.....difinately factory 202 with sals diff

I'm not sure what you're on about there, but VL V8s have the battery on passenger side YES, but have BW78 diffs. I know, because i have one in my front yard right now.

Never has there been a 202 in a VL.

NZ VL com
06-05-08, 14:37
it was difinitly a VL boot had little lip VL stlye front VL interior. my first impression was that it was a V8 but my neighbour (ex GM assembly worker) said 202 and 3.36 diff ratio was std on 202. all i can think off is that it was end of VK stuff into new VL car.just let other people know my findings and things arnt always as they appear

5spdvl
06-05-08, 15:02
I would certainly hope that a 202 was standard on a 202. :p

I dunno dude, certainly not in Australia.

Psi_Wagon
06-05-08, 17:18
it was difinitly a VL boot had little lip VL stlye front VL interior. my first impression was that it was a V8 but my neighbour (ex GM assembly worker) said 202 and 3.36 diff ratio was std on 202. all i can think off is that it was end of VK stuff into new VL car.just let other people know my findings and things arnt always as they appear

if you or your neighbour cant tell the difference between a 202 and a v8 there is some serious issues there.....

5spdvl
06-05-08, 17:45
I think he means by the way it sounded.

Otherwise, yes. :D

NZ VL com
06-05-08, 17:49
there was no engine in car when i got it all i could see was 202 mounts

Psi_Wagon
06-05-08, 19:23
lol and again WTF, sense any make it doesnt?

5spdvl
06-05-08, 19:36
lol and again WTF, sense any make it doesnt?

Ahaha, burned. I was thinking the same thing.

So you think that VL had a 202 in it because of the mounts that were left over after the motor was removed? Perhaps you can check their part number.

Anyway, this thread is kind of getting of topic now. Its about BW78 diffs, not 202s in VLs.

NZ VL com
07-05-08, 19:47
what are the axle lenghts in VL diffs? might get 28 spline 9in to fit

88tbo
21-05-08, 18:42
I'm sure my diff has a drain plug but 1st post states VL diffs had no drain plug? Also in my 'Gregory's manual' it shows diff drain plug>???

5spdvl
21-05-08, 19:23
There is no diff drain plug in VL BW78 housings. The plug you're referring to is probably the filler plug, located on the diff cover.

Only way to drain the oil is to remove the diff cover, or remove the axles.

VLHERO has mentioned somewhere on here how he drilled and tapped a hole for a drain plug in his diff housing when he had the centre out.

88tbo
21-05-08, 20:12
good call. :rolleyes:

Filler plug, not drain plug. Cheers

X-ZemPt
24-06-08, 02:34
Quick question.
Lookin at buying a wagon, and the guy said it had a 4 pinion single spinner diff.

Just wondering if this would be a 28spline diff?

It is in a VL Wagon Turbo.

Cheers

5spdvl
24-06-08, 11:51
If its the factory diff, then it PROBABLY is 28 spline (as all turbo and V8 models had 28 splines axles/centres).

VNs were built with 4 pinion open 28 spline centres, so it could be one of those. Best bet is to pull and axle out and count, that way you'll know for sure.

X-ZemPt
24-06-08, 13:27
Cheers!

5spdvl
24-06-08, 17:42
No problems. :cool:

theVLguy
24-06-08, 18:11
should this also be stickied in the suspension, brakes and diff subforum?

5spdvl
24-06-08, 18:16
It should be PMed to all n00bs. :rolleyes:

But yes, probably.

Haras
21-07-08, 15:06
do r31s have 25 or 28 spline axels n 4 pinion centre

5spdvl
21-07-08, 16:06
AFAIK, they all have 28 spline axles. I would pm JET R31, he would have a better idea than me.

Steve
21-07-08, 22:02
R31 Skylines have 28 spline axles with 4 pinion centers
R31 Pintaras have 25 spline axles with 2 pinion centers

5spdvl
22-07-08, 11:53
Thanks Steve. :cool:

Will edit the first post a bit later today.

airbagsVL
22-07-08, 20:53
really good write up mate!

5spdvl
23-07-08, 12:05
Thanks mate. Someone had to do it.

Paranoid
23-07-08, 23:33
VL-VS (Non IRS) LSD centres are the same? providing they're 28 spline.. correct?

Steve
23-07-08, 23:44
Yep

Idiotism
24-07-08, 06:23
So whats the best or should i say cheapest way to convert my stocker calais single spinner (3.08) to a LSD 3.45? im assuming its a 25 spline

Psi_Wagon
24-07-08, 06:58
u assume wrong lol, itll be 28 spline. you will have to source an lsd center aswell as a 3.45 gear set.

not so cheap tho. probably easier to buy a new complete diff.

Idiotism
24-07-08, 08:02
O. In original thread it stated that N/A had 25 spline axles. I didnt specify sry that it was a N/A diff. Everything else in the car is now turbo except for diff. But from the sounds of it buying a whole new turbo diff might be easier.

5spdvl
24-07-08, 16:20
Yes, but you also stated that you have a 3.08 ratio diff - which is a V8 diff, and therefore 28 spline. All turbo and V8 diffs, regardless of LSD or not, are 28 spline.

If you have a 3.08 diff, I would recommend selling the diff for around the $400-$500 mark and buying a complete 28 spline LSD 3.45 diff. Unless you know how to set pinion bearing pre-load, its not within your reach to convert your diff.

Idiotism
24-07-08, 19:49
cheers 5spd. Delayed comment by myself...

mulligan
04-08-08, 08:27
When spinning the wheels to test if LSD or not do you have the car in neutral or gear?

5spdvl
04-08-08, 12:24
Doesn't make a difference. Probably going to be easier on you if its in neutral.

webbey
06-08-08, 23:34
hey guys has anyone got the track length of the BW78 that went into the VL i wana see if it will go close to a straight fit into my EH with only changing suspension mounts cheers nick.

5spdvl
07-08-08, 12:22
Do you mean width, from axle flange to axle flange?

Psi_Wagon
07-08-08, 20:31
1250mm :P
and VN diffs are 1300.

fk i know that off the top of my head now, lol i played with the two diffs in my vh

webbey
09-08-08, 10:47
Do you mean width, from axle flange to axle flange?


Nah from outside edge of one disk brake (caliper) or outside edge of one drum to the outside edge of the other drum or caliper :)

Antranik
09-08-08, 12:58
I don't get if a VL came out in 3.45, and a different car 4.11's, how do people make it fit/adapt?

Please explain

5spdvl
09-08-08, 18:30
Same brand of diff . :) Interchangeable parts.

webbey
10-08-08, 21:29
1250mm :P
and VN diffs are 1300.

fk i know that off the top of my head now, lol i played with the two diffs in my vh


where are u taking those measurements from dude i jist got a r31 housing and its 1400mm without the discs on and they are 1inch shorter than vl diffs

mainyard
15-09-08, 19:50
This might be a question answered before but bear with me :)
It didnt seem to be answered in the great write up.

Ive got a wagon 3.45, 25 spline rear end and I want to convert it to 3.9, 28 spline off an R31 sedan. (I will be getting the full rear axle disc to disc)

Is it just as simple as taking the 25 spline centre out and replacing it with the new gears and the 28 spline centre?

Or is there some other bearing or something that is going to stop me.

Thanks

NZ VL com
15-09-08, 20:00
the centre will change over but the axles (or 1 axle) are the wrong length

-Sleepy-
15-09-08, 20:47
And the stud pattern on the r31s is different to the vl aswell

NZ VL com
25-09-08, 18:35
got a 28 spline lsd here that is loose/worn. can if be tightened up and how hard a job is it to do at home etc..
#50 the irs centres are the same aswell but are BTR ENG brand

5spdvl
26-09-08, 12:48
Yes, LSDs can be rebuilt to be tighter, with different sized shims.

It's not a job I would recommend for a novice.

NZ EVLHSV
26-09-08, 13:22
got a 28 spline lsd here that is loose/worn. can if be tightened up and how hard a job is it to do at home etc..
#50 the irs centres are the same aswell but are BTR ENG brand
Courier it up to Tony at Steelie Gears in Auckland

madrx3boy
29-09-08, 19:42
hi guys i have a berlina sedan with single spinner 3.45 drum rear end.(well im 99% sure its a single spinner and 3.45 ratio but i havent checked the i.d. tag on it yet).

I want to convert it to an LSD with disc brakes, what are my options? I know i could bolt a whole vlt or vl v8 rear end straight in, but here in nz they are not exactly easy to find.

if i do find a vlt or a vl v8 one, but its not lsd, i could just take it to a diff shop and get them to fit lsd centre to it am i correct?

but i likely wont be able to find a vlt or vl v8 rear end soon, so is it possible to convert mine to lsd and disc brakes? im guessing as a standard na drum brake diff its probly just the 25spline 2spider type.

so if i was to put lsd in is it possible to source 25spline lsd centre?
what other options do i have? could i replace all the centres and axles etc with 28spline stuff ie would the 28spline stuff fit/bolt in to the 25spline housing?

or if i found an r31 skyline with lsd and disc would the whole rear end bolt in or just the centre and axles?

even if i just know for sure from you guys what parts i need then i can just take it all to a diff shop to get it done - those two words shimming and backlash send shivers down my spine every time i read them in a thread lol.

and can anyone tel me, if i was to put 28spline internals into my standard housing, how would i go about replacing the drums with some disc brakes (or does anyone have a link to a thread about this or something?)

thanks heaps.

Psi_Wagon
29-09-08, 19:55
where are u taking those measurements from dude i jist got a r31 housing and its 1400mm without the discs on and they are 1inch shorter than vl diffs

housing end to housing end.

VL_JOHN
01-10-08, 17:23
As far as I've read in old car magazines LSDs were optional on series 1 Turbos and Standard on all series 2 Turbos.

5spdvl
01-10-08, 18:44
hi guys i have a berlina sedan with single spinner 3.45 drum rear end.(well im 99% sure its a single spinner and 3.45 ratio but i havent checked the i.d. tag on it yet).

I want to convert it to an LSD with disc brakes, what are my options? I know i could bolt a whole vlt or vl v8 rear end straight in, but here in nz they are not exactly easy to find.

if i do find a vlt or a vl v8 one, but its not lsd, i could just take it to a diff shop and get them to fit lsd centre to it am i correct?

but i likely wont be able to find a vlt or vl v8 rear end soon, so is it possible to convert mine to lsd and disc brakes? im guessing as a standard na drum brake diff its probly just the 25spline 2spider type.

so if i was to put lsd in is it possible to source 25spline lsd centre?
what other options do i have? could i replace all the centres and axles etc with 28spline stuff ie would the 28spline stuff fit/bolt in to the 25spline housing?

or if i found an r31 skyline with lsd and disc would the whole rear end bolt in or just the centre and axles?

even if i just know for sure from you guys what parts i need then i can just take it all to a diff shop to get it done - those two words shimming and backlash send shivers down my spine every time i read them in a thread lol.

and can anyone tel me, if i was to put 28spline internals into my standard housing, how would i go about replacing the drums with some disc brakes (or does anyone have a link to a thread about this or something?)

thanks heaps.

Please take the time to read the thread, I didn't just write so I could get my emotions down.

Barnsey
03-11-08, 19:00
does anyone know how to figure what a diff came out standard with by the i.d tag? i bought it under the impression it was a vl turbo diff but i.d tag says 3.08 so now im questioning whether its lsd and original disc brake? diff is currently out of car.

thanks in advance.


P/N 92035068
RATIO 3.08 SER.No 1111

cheers.

pmac
03-11-08, 19:07
Open up the pan, take a look at the ring gear. It has the gear ratio stamped on it. An LSD center will have two rows of bolts on the left hand side of it.

Plus 3.08 ratio diffs only came out in a v8 thus it should be original disc brake and 28 spline. Oh and you really DONT want 3.08 gears in a turbo six youll be waiting ages for boost lol

Barnsey
03-11-08, 19:18
yeh its not turbo just yet... i'll get the diff gears changed before turbo. at least it'll be 28 spline

NSNPWR
04-11-08, 08:43
As discussed, this is the diff out of my car in question...I was told by the previous owner the diff was out of a Walkinshaw...its possible they just used the housing and kept the gear set and axles...hence the 3.08 tag on the housing....

My Berlina was a Factory Manual Turbo...

Theres no way known it had 3.08 highway gears in it....

If you dont wanna take the rear casing off, like I said in PM, measure the number of rotations of the wheels/hub to the number of turns of the tailshaft......and also pay attention to which way BOTH wheels/hubs turn when you rotate one of them...

NZ EVLHSV
04-11-08, 09:13
if i do find a vlt or a vl v8 one, but its not lsd, i could just take it to a diff shop and get them to fit lsd centre to it am i correct?
Yes you can get a diff shop to put LSD in either 28 spline (VLT/V8) or 25 spline (N/A 6). I doubt you will find a VLT diff and "if" you find VL V8 diff you will also need to change the diff gears as 3.08 is way to long


could i replace all the centres and axles etc with 28spline stuff ie would the 28spline stuff fit/bolt in to the 25spline housing?
Yes you can do that. However 28 spline axles are hard to come by in NZ


even if i just know for sure from you guys what parts i need then i can just take it all to a diff shop to get it done - those two words shimming and backlash send shivers down my spine every time i read them in a thread lol.

Your best bet is to ring Tony at Steelie Gears (09 276 6297). He rebuilt my diff with 28 spline axles, 4 spider VR SS LSD and 3.45 gears for around $1,000. Thats with me taking the diff down to him out of the car

If you have less than 150rwkw I would just get him to put an LSD and disk brakes on your 25 spline diff

5spdvl
04-11-08, 10:29
does anyone know how to figure what a diff came out standard with by the i.d tag? i bought it under the impression it was a vl turbo diff but i.d tag says 3.08 so now im questioning whether its lsd and original disc brake? diff is currently out of car.

thanks in advance.


P/N 92035068
RATIO 3.08 SER.No 1111

cheers.

That came from a VL V8, because only the V8s had such a ratio. Having said that, it should also have disc brakes and be 28 spline.

You may also like to view this thread:

http://www.calaisturbo.com.au/showthread.php?t=21047

NSNPWR
04-11-08, 12:29
Is anyone listening?

That diff was out of my car...and the previous owner told me the diff itself was out of a Walkinshaw before being rebuilt...I can see no reason why they would not fit the 3.45 gears back into that diff/housing....and the car certainly didnt drive like it had 3.08 gears...it lit up everwhere.

Anyway, mark a line with a white texta on the hub and a line on the diff where the tailshaft bolts up to it....rotate the hub paying attention to how many rotations you get from the snout/front of the diff....

Or pull the plate off the back....could probably do with changing the oil in it anyway...

5spdvl
04-11-08, 13:22
Oh, I had to read a few posts a couple of times before I understand what's going on here. Sorry NSNPWR.

I didn't know Walkys were fitted with 345s from factory. In that case, that makes it a bit fishy that the diff is now sporting a 3.08 tag. Also, why would someone swap a Walky diff into anything else? I guess someone could have wrecked a Walky if it was written off.

2QUIK2C, you need to take the cover off and see what ratio is stamped on the side of the ring gear.

NSNPWR
04-11-08, 13:47
Im not saying Walkys came with 3.45s but my car was a factory Berlina Turbo Manual with factory LSD, 28 spline axles and 4 wheel disc brakes....im thinking they would have taken the gear set out of the original diff and put it in that housing with the 3.08 tag on it...Muzza probably smacked a kerb and bent something...

I will be amazed if that diff has 3.08 gears in it because my car never felt sluggish or 'tall'...is definitely LSD...there's a driving shot in my thread under VL Turbos of the car laying down 2 lines! And a shot of when I raced it on slicks of the car smoking both wheels!

Sorry to rant but I dont want 2QUICK2C thinking ive sold him a dudd diff...ive owned that car 7 years and never had the diff out or looked at the tags...

5spdvl
04-11-08, 13:55
Well, I can't really comment on what your diff is then. All I can advise 2QUIK2C is to check the ring gear stamp.

Barnsey
04-11-08, 16:48
dw i'll check the stamp on the ring gear, doesnt bother me that much if it is 3.08 i'll just change gear ratio to 3.9s or something lol... im sure you would of known what gears were in it anyway so i'll take your word with 3.45s :)

man i really need to change my user name! its gay :(

5spdvl
05-11-08, 14:51
PM SirGeo if you want to change it.

julzvlsl
05-12-08, 13:14
hey,
i have a 87 vl sl, manual, non turbo, that i got off my grandfather (one owner since new) my question is, was it an option for disk rear on that model? because my car has never been touched, from the day he bought it off the showroom floor. I keep reading the post's here and people keep saying that it was lsd option and drum rear end for sl/exceutive.... then why does mine have disk rear end?

im confused? LOL

thanks guys

Julz

LUXJET
23-12-08, 19:25
when i got my vl 5L it had a salisbury disc brake lsd diff? has anyone else ever heard of a vl v8 with a salisbury?

also i think the diff gears were 2.79 or wat ever they are...

5spdvl
24-12-08, 08:18
I have heard of some VLs coming out with some unusual diff combos. Best to let us know what it says on the build tag in the engine bay, so we can compare it with the known diff combo ID codes.

AFAIK they're supposed to have BW78 3.08 28 spline 4 pinion open wheeler (unless optioned with LSD), with disc brakes.

hey,
i have a 87 vl sl, manual, non turbo, that i got off my grandfather (one owner since new) my question is, was it an option for disk rear on that model? because my car has never been touched, from the day he bought it off the showroom floor. I keep reading the post's here and people keep saying that it was lsd option and drum rear end for sl/exceutive.... then why does mine have disk rear end?

im confused? LOL

thanks guys

Julz

As mentioned in the first post of the thread, disc brakes and LSD were optional on all models. Menaing, your grandfather optioned it with disc brakes. Check what codes are listed on thebuild plate, the disc brake disc diff code will be there (if it's never been modified).

bubalu
30-12-08, 20:40
what measures (if any) do you guys take when changing the diff gears to correct the speedo reading?

5spdvl
31-12-08, 16:36
Most would take none I would guess, but you can experiment with different diameter rims (bigger rims equal a higher actual speed).

Otherwise, I believe Jaycar make a speedo adjuster box (that may only be for electronic speedos, like VN onwards); or even VDO themselves.

Steve
31-12-08, 21:29
what measures (if any) do you guys take when changing the diff gears to correct the speedo reading?


read this thread....
http://www.calaisturbo.com.au/showthread.php?t=129044&highlight=diff+gear

TurboKiwi
09-01-09, 12:51
Can a 25 spline single wheeler, take the lsd guts outa a 28 spline lsd. Making the 25 spline single wheeler a lsd ?

5spdvl
09-01-09, 13:53
No. The 28 spline LSD has 28 spline carriers; transferring the "guts" makes the recipient centre 28 spline.

Besides, open wheeler and LSD centres have completely different casings - the "guts" wouldn't fit into an open wheeler, and vice versa.

You're better off getting a complete disc to disc 28 spline LSD.

bjr18684
28-04-09, 16:21
I have a VL wagon with a 25 spline housing and I want to get it built for 28 spline or maybe aftermarket 31 spline gear (full spool and new axles, and discs). Apart from the lower shock mounts, are there any differences at all between the wagon and sedan housings?

I have been told by a diff shop that I'd need to find a 28 spline housing and get the mounts cut off my diff and them rewelded to the new housing with all the good bits.

Now I want to know if this is true or if I need to find another diff shop. To me this sounds like BS. Are they trying to get more work for themselves (or maybe just more money)?

Psi_Wagon
28-04-09, 17:51
its is bs, as u know the only diff is the shock mounts.

any sedan/wagon guts will go into your wagon housing, wether it be 25/28 spline.

just do what i did and get a cheap sedan 28pline diff and transfer it into your housing, job done

87calais
03-06-09, 21:28
And for anyone querying IRS conversions It has been done on 2 VL's i know of, big job, read this page to get an idea of the work involved.

5spdvl
03-06-09, 21:58
Got a link there 87calais? I'd be very interested in seeing such a conversion.

airbagsVL
03-06-09, 23:49
i remember reading about a guy who done it, was a huge job, he put the full running gear from a r32 gtr into it including the 4wd system lol.

MxPx VL
04-06-09, 02:03
Link for VL Transmission Ratios (http://www.uniquecarsandparts.com.au/holden_commodore_VL_technical_specifications.htm)

5spdvl
04-06-09, 08:36
i remember reading about a guy who done it, was a huge job, he put the full running gear from a r32 gtr into it including the 4wd system lol.

I have also seen a VL with full GTR running gear, but that was a long time ago, before I knew what was involved.

Link for VL Transmission Ratios (http://www.uniquecarsandparts.com.au/holden_commodore_VL_technical_specifications.htm)

Thanks for that MxPx VL, however you need to be wary of the accuracy of that site. There are a number of mistakes, most noteably the RB30 being listed as a pushrod motor. I've emailed them listing their mistakes, nothing came of it.

airbagsVL
04-06-09, 15:26
lol, its funny you say that as i also noticed that they said its a pushrod motor and i emailed them aswell. How could they get that wrong!!!

5spdvl
04-06-09, 15:31
That page is full of mistakes, it's just poor.

NZ VL com
04-06-09, 19:11
i have heard that irs from opel monza and others fit straight into vl mounts,just need custom swaybar or something,but untill i see it to believe it.....after all the VL director has irs, wonder if it was taken from vauxall UK?

5spdvl
04-06-09, 23:35
I doubt it - an IRS diff requires a cradle, and there are no mounts for one on a standard VL floorpan.

NZ VL com
06-06-09, 07:48
its just what ive heard,so if anyones got a opel monza check it out and let us know

87calais
06-06-09, 22:42
That was good form wasn't it! No link lol.

Try this one:
http://www.driftshop.com.au/twinvl/nissanirs.html

I know of 2 4WD VL's, one used IRS, the other was live axle, but the owner was looking to change to IRS, haven't seen him in ages so not sure if it got done or not.

The guy who owns the car in this link is a member on this site, not sure how much he gets on here anymore, that page hasn't been updated in a fair while either.

its just what ive heard,so if anyone's got a Opel Monza check it out and let us know

The Opel Monza was built on the same platform as the first gen commodores, and yes i believe the IRS in the VL Directors was similar to the Monza setup. Never had the opportunity to check one out though to see how it fits up.

5spdvl
07-06-09, 03:39
Thankyou 87calais, that is truly inspiring. Added to the first post. :)

7FOUR7
26-07-09, 17:21
I have a 28 spline spooled vlt diff with 3.9s, can I just swap the locked center for an lsd one and keep my 3.9s?

5spdvl
26-07-09, 19:05
Yes Brad. You just need to remove the ring gear from your locked centre, and bolt it onto the LSD centre. :)

7FOUR7
26-07-09, 20:25
too easy, cheers brother!

5spdvl
26-07-09, 21:06
No wucken furries! :D

5spdvl
06-10-09, 11:52
Update: Harrop Detroit TruTrac now available for BW78!! $1540, including GST.

More information as I get it.

http://www.harrop.com.au/products/drive_line_and_suspension/ttrc9492-00.html

sleepyboy
07-10-09, 09:01
Great thread, still a little confused though so ill shoot an idiot question out.

I've got a 25 spline in my vl atm and am looking to convert it to LSD. I've been looking at getting the Harrop Detroit TruTrac unit, and have a few questions. How would i go about having this put in my diff atm if possible? What would need taking out/replacing if its possible? OR would i just need to go buy a 28 spline and have this installed - same question would need taking out/replacing in the 28 spline?

Thanks .

5spdvl
07-10-09, 09:15
The TruTrac comes standard in a 28 spline unit. If you were to put this in, you'd also need stock 28 spline axles. If you wanted a 25 spline TruTrac, you'd need to contact Harrop for a quote on the custom unit.

I'm currently waiting on a price on a custom 31 sline TruTrac.

I don't know of anyone that has fitted this centre to a BW78 yet, so I don't know if the housing needs machining. Maybe I'll be the first! :p

sleepyboy
07-10-09, 10:04
Ahhhh yeah thought so mate, thanks heaps for the info your a legend.
Now time to find a 28 spline disc to disc !

5spdvl
07-10-09, 10:16
For Sale section should help you out. VL V8s came 28 spline disc to disc; you might be able to pick up a rolling shell cheap if you're lucky.

misk
10-01-10, 21:57
just thought id post these links as they gave me a good understanding of what actually goes into the process of setting backlash and what not.

http://www.therangerstation.com/tech_library/setting_backlash.htm
http://www.drivetrain.com/parts_catalog/ring_and_pinions/ring_and_pinion_installation_instructions.html

WAGASM
12-01-10, 08:47
hey. just wondering what LSD diff head can i put onto a VL? i have been told i can take a lsd diff head from a vr or vs and put it straight on? dont really want to buy a whole diff as i ahve allready done the disc brake conversion to the rear..

5spdvl
12-01-10, 09:32
Umm...by head do you mean centre? Or carrier? If so, the first post will answer your question.

vl396
16-02-10, 08:15
"Similarly, a VN-VS diff housing (excluding IRS; see below) cannot be bolted onto a VL chassis (they are too wide)."

I have a vn diff in my vl.bolted straight in?????Its only about 30mm wider total

5spdvl
16-02-10, 09:56
Yes, they can be bolted onto a VL chassis, but you'll find if you start looking at aftermarket rims, your offsets will be very difficult to work with.

vl396
07-03-10, 14:19
Yes, they can be bolted onto a VL chassis, but you'll find if you start looking at aftermarket rims, your offsets will be very difficult to work with.
Im going to run ve ssv mags.all i need to do is bend the lip and maybe roll the rear guards.what handbrake cable should i use vl or vn??anyone know i have disc brakes on my vn diff btw

Psi_Wagon
07-03-10, 15:49
Im going to run ve ssv mags.all i need to do is bend the lip and maybe roll the rear guards.what handbrake cable should i use vl or vn??anyone know i have disc brakes on my vn diff btw

use the vn handbrake cable.

those wheels have no chance of fitting with the vn diff, no matter how much guard bashing u do.

and its 50mm longer overall

vl396
08-03-10, 13:30
use the vn handbrake cable.

those wheels have no chance of fitting with the vn diff, no matter how much guard bashing u do.

and its 50mm longer overall
i have the on them on there at the moment and they just clear the inner lip of the rear guard.I just need to bend it the maybe roll the guards.

Balfizar
10-03-10, 20:02
VLT - 3.45 gears, 4 pinion center, 28 spline axles, disc brakes - LSD Optional
V8 - 3.08 gears, 4 pinion center, 28 spline axles, disc brakes - LSD Optional, 3.45 gears Optional

NA's :
SL/Exec - 3.45 gears, 2 pinion center, 25 spline axles, drum brakes, possible LSD Optional
Berlina - 3.45 gears, 2 pinion center, 25 spline axles, drum brakes, LSD Optional, Disc brakes optional
Calais - 3.45 gears, 2 pinion center, 25 spline axles, disc brakes, LSD Optional

V8 - 3.08 gears, 4 pinion center, 28 spline axles, disc brakes - LSD Optional, 3.45 gears Optional

Part numbers for 3.45 ring gear and pinion are not listed for V8
and the option code (GM3 - 3.45) is only listed for 3.0 ltr engines, the rest looks good.

Cheers
Balfizar

madrx3boy
10-03-10, 20:34
^^correct yeah I think If you go to holden or any parts shop and ask for a 3.45 crown and pinion set for a VL V8 nothing will come up on there computer.

However as stated, 3.45 was optional for the V8s, they would have just swapped the gearset with one from a 3L VL

(same sorta thing if you bought a Berlina and wanted Rear Discs - they would just use a rear disc setup from a Calais/Turbo/V8 model.)

5spdvl
11-03-10, 09:58
I'm actually not sure if final drive ratio was optional. Not heard of any VL ever having had a different ratio selected from factory standard.

vl396
11-03-10, 16:21
do any of you guys know if a master cylinder from a vn will fit on a vl?Ive changed it from drums to vn discs.the vn master cylinders are easier to find and cheaper.

5spdvl
12-03-10, 08:55
Yes, it will fit.

madrx3boy
13-03-10, 15:23
I'm actually not sure if final drive ratio was optional. Not heard of any VL ever having had a different ratio selected from factory standard.

oh ok, that's just what I read in your post at the beginning of this thread - it's where all my knowledge of vl diffs comes from - not having a go, just thought I'd mention it ;)

Balfizar
13-03-10, 18:03
do any of you guys know if a master cylinder from a vn will fit on a vl?Ive changed it from drums to vn discs.the vn master cylinders are easier to find and cheaper.

You can use the PBR P10330 15/16" master cylinder or go for the
PBR P10331 1" both were used on VL to VR non-ABS. IMO the dual diaphragm booster PBR VH512 and PBR P10331 1" is the go. This combo was standard on V8 /Turbo/HDT

first?vl
13-03-10, 21:57
2 VL DIRECTORS (9 directors in total)WERE BUILT WITH IRS.ONE OF THESE I KNOW IS IN A PRIVATE CAR COLLECTION.I WAS TOLD THE OTHER HAD BEEN CRASHED.

Psi_Wagon
14-03-10, 08:24
^ the point of that being ?

5spdvl
14-03-10, 10:51
Thanks for that first?vl, I'll umm....find somewhere to point that...useful information.

first?vl
14-03-10, 15:16
Just A Bit Of History....lol

Morgz
16-03-10, 05:43
Tourettes?

5spdvl
16-03-10, 19:55
Update - Detroit TruTrac Helical Gear LSDs available for HQ-HZ/VB-VK 10 Bolt Salisbury Diffs!! Entire Commodore and early Holden range covered!

http://www.harrop.com.au/products/drive_line_and_suspension/ttrc9492-00.html

vl396
15-04-10, 14:51
my vn diff says "high performance lsd" on the tag. that mean its an vn ss diff?
cheers

bsakid
02-05-10, 00:12
possibly a very stupid question, but would I be able to fit this to a VL without to much hassles, meaning diff and axles disc to disc not everything else (unless it works better swapping everything)

http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&item=300422541043&ssPageName=STRK:MEWAX:IT

-I will be converting to manual shortly
-I'm running interceptor rims nothing big and flashy
-doing the rear disc conversion would be part of the diff swap

5spdvl
02-05-10, 13:09
my vn diff says "high performance lsd" on the tag. that mean its an vn ss diff?
cheers

Not necessarily. Could be from any live axle optioned second generation Commodore optioned with an LSD.

possibly a very stupid question, but would I be able to fit this to a VL without to much hassles, meaning diff and axles disc to disc not everything else (unless it works better swapping everything)

http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&item=300422541043&ssPageNam e=STRK:MEWAX:IT

-I will be converting to manual shortly
-I'm running interceptor rims nothing big and flashy
-doing the rear disc conversion would be part of the diff swap

That IRS setup won't bolt into a VL. You can use the diff centre and gears in your existing housing, as well as the calipers and discs.

loui2035
10-05-10, 21:14
quick question. i have a drum brake diff with 25 lsd and a disk break diff non lsd.. can i swap the centre's?

5spdvl
11-05-10, 08:44
As long as both centres and pairs of axles are 25 spline BW78, then yes.

FST-747
05-06-10, 16:04
ive got a vl calais with a factory lsd, its a non turbo, dus it have the 28 or 25 spline axles?
and is there a chance that it could have the 28 spline??

madrx3boy
05-06-10, 18:22
would say that they'd be 25 splines, (all NA VL's generally had 25 splines, LSD was optional but would still keep 25 splines).

There's always the possibility that yours are 28 spline, as there were some different combinations. what's the numbers on your diff tag (located on the diff's sump cover -held on by one of the cover bolts). there's a post somewhere in this thread that lists what the specs of each tag are.

FST-747
05-06-10, 19:36
yeah i got the codes ill have to take a look at the diff n see

madrx3boy
05-06-10, 19:58
Compare to the ones in this thread: http://www.calaisturbo.com.au/showthread.php?t=21047

Although I think some people have found their diffs don't match any of those numbers, or they match up to the wrong number or something. should give you a fair idea tho.

you could always pull your axles out and count the splines :p

5spdvl
06-06-10, 18:58
Counting the splines is the only accurate method.

dvs_wgn
07-06-10, 18:17
good wright up with plenty of good stuff people need to no

Jakeb110
10-09-10, 09:41
What falcon borgy axles would go straight into a vp diff? I want the falcon/nissan stud pattern, im crazy i know

5spdvl
10-09-10, 12:29
None. They are different lengths to a VP diff. If you want that stud pattern, if you can't find adaptors, find an axle supplier and ask they either supply axles with the appropriate stud pattern or get them undrilled, then have a wheel shop etc drill them for you.

h|ghland
12-09-10, 19:59
hey ive got a 28spline 4 pinion without the lsd option - berlina turbo wagon

i want lsd, what are my options ? can i chuck lsd in cheap or am i better off sourcing a new diff

thanks :)

Psi_Wagon
13-09-10, 18:15
all you need to do is get an lsd centre man, from anything VL-VS live axle

h|ghland
14-09-10, 21:06
that sounds reassuring... can you buy them new or reconditioned from a diff shop you reckon ?

Wraith666
14-09-10, 22:36
Or you could go down to your wreckers and sus out some EA-EL wagons and see if they have LSD. Take centre out bolt into your diff easy as. Least you know it will have less chance of being thrashed being leaf sprung.

exchaser
14-09-10, 22:38
You can buy them new reconditioned on ebay from about 350 bucks. Centre only, no gears, in 28 and 31 spline configurations..

5spdvl
15-09-10, 09:43
Or you could go down to your wreckers and sus out some EA-EL wagons and see if they have LSD. Take centre out bolt into your diff easy as. Least you know it will have less chance of being thrashed being leaf sprung.

Problem with that is those centres will most likely have different gearing to his current diff, which means changing either the ring gear or pinion.

elare69
06-10-10, 19:12
hey, would v8 wagon diff fit into calais sedan

SHIZNIK
06-10-10, 22:26
hey i got v8 3.08 lsd diff in my vlt atm, apart from buying diff gears wats another option? pintara diff? also ive heard some older holden rodeo diffs had 4.11's anyone no of this?

LUXJET
07-10-10, 10:21
you wont get a rodeo diff under a vl nor pintara.. just change the gears

Rollin
07-10-10, 12:21
Hi Guys, so ive done the mandatory reading of this thread for the answers to my question but can seem to find one so here goes:

I currently have a 25 spline sedan non LSD diff sitting in the shed that was originally in the car.

I have a 28 spline Non LSD wagon diff in the car now (found out the shock mounting were different after we pretty much had it in so just made it fit!).

I have a 28 spline LSD carrier unit and 3.08 gears (i have heard that the diff gears are all the same for 25/28 spline).

Can i straight swap the 28 spline wagon internals (and install the LSD/diff gears at the same time) into the 25 spline sedan diff housing?

So basically i wanna gut one diff and fill it with the other internals.

Cheers guys

NZ EVLHSV
07-10-10, 16:06
99% sure you can, 5spdvl will be able to confirm. If you are doing that at least put a set of 3.45s in at the same time

elare69
07-10-10, 16:37
3.7s slapping in

madrx3boy
07-10-10, 19:51
^^I've read a lot on here about VL Wagon axles being different in lenght to VL Sedan axles (read lots of arguements), some people reckon they're the same some reckon they're different) but somehow I think maybe they're getting confused with the difference between VL and VN axles.

But yes 5spdvl knows all about this stuff so he'll be able to help ya

Psi_Wagon
07-10-10, 20:26
Hi Guys, so ive done the mandatory reading of this thread for the answers to my question but can seem to find one so here goes:

I currently have a 25 spline sedan non LSD diff sitting in the shed that was originally in the car.

I have a 28 spline Non LSD wagon diff in the car now (found out the shock mounting were different after we pretty much had it in so just made it fit!).

I have a 28 spline LSD carrier unit and 3.08 gears (i have heard that the diff gears are all the same for 25/28 spline).

Can i straight swap the 28 spline wagon internals (and install the LSD/diff gears at the same time) into the 25 spline sedan diff housing?

So basically i wanna gut one diff and fill it with the other internals.

Cheers guys

answer is Yes you can. ive done it both ways before, sedan to wagon and vise versa.

Rollin
08-10-10, 09:57
answer is Yes you can. ive done it both ways before, sedan to wagon and vise versa.


Thanks man, so you have swapped spline sizes too?

Psi_Wagon
08-10-10, 12:10
yep the current diff in my vh was a 25 spline single spinner, i put the guts form my wagon 28 spline lsd into it

Rollin
08-10-10, 12:22
yep the current diff in my vh was a 25 spline single spinner, i put the guts form my wagon 28 spline lsd into it

Awesome, cheers man. Was it hard to swap it all over. Do you happen to know the starting torque for the crown wheel/pinion and also the backlash of crown wheel to pinion?

Psi_Wagon
09-10-10, 21:40
np's man.

it was pretty simple, and i couldnt tell you the torque settings as i did it by feel. that diff has been going strong minispooled for years now with no probs, haha


Edit: here you go, straight from the workshop manual for the 28 spline diff;

http://i733.photobucket.com/albums/ww338/PsiWagon/Clipboard012.jpg

http://i733.photobucket.com/albums/ww338/PsiWagon/Clipboard011.jpg

Brocksta
15-10-10, 03:28
Hi guys I need some advice, I have just done a complete driveline change on my VL Calais and i stupidly left it up to the mechanic to decide on a bulletproof diff for it as the car is putting out over 400rwkw and everything else in the driveline is tuff as. He installed a Full spool with 31 spline Mosley axles in my original BW housing and original 3.89:1 gears. But it is a pain in the ass for the street so i am trying to find the best option for a really tuff diff and is it possible to retain the 31 spline axles and just change it back to a LSD centre. Cheers

5spdvl
15-10-10, 13:55
Hi Guys, so ive done the mandatory reading of this thread for the answers to my question but can seem to find one so here goes:

I currently have a 25 spline sedan non LSD diff sitting in the shed that was originally in the car.

I have a 28 spline Non LSD wagon diff in the car now (found out the shock mounting were different after we pretty much had it in so just made it fit!).

I have a 28 spline LSD carrier unit and 3.08 gears (i have heard that the diff gears are all the same for 25/28 spline).

Can i straight swap the 28 spline wagon internals (and install the LSD/diff gears at the same time) into the 25 spline sedan diff housing?

So basically i wanna gut one diff and fill it with the other internals.

Cheers guys

Yes, you can swap the internals between sedan/wagon housings. Wouldn't recommend running a wagon housing under a sedan and vice versa though!

Hi guys I need some advice, I have just done a complete driveline change on my VL Calais and i stupidly left it up to the mechanic to decide on a bulletproof diff for it as the car is putting out over 400rwkw and everything else in the driveline is tuff as. He installed a Full spool with 31 spline Mosley axles in my original BW housing and original 3.89:1 gears. But it is a pain in the ass for the street so i am trying to find the best option for a really tuff diff and is it possible to retain the 31 spline axles and just change it back to a LSD centre. Cheers

400rwkw is a HUGE amount of power for the street, probably almost to the point where you wouldn't drive it on the street. The only diff centre that'll give you LSD action without breaking is the Harrop TrueTrac helical LSD, but be prepared to pay around $1500 for it.

Rollin
20-10-10, 09:49
np's man.

it was pretty simple, and i couldnt tell you the torque settings as i did it by feel. that diff has been going strong minispooled for years now with no probs, haha

Edit: here you go, straight from the workshop manual for the 28 spline diff;



Awesome thanks mate. Pulled the diff apart and it looks like they have shortened a VN diff so the axles are too long. They tried to shorten them and made a helluva mess of the splines when they tried to respline them. So now the axles dont butt all the way into the carrier. Gotta mate that reckons he can get them sussed though. Either that or i go back to 25 spline single spinner!! :(

Other than that all your advice has been graet man. Everything swapped over mint as...

Cheers

FATMAN
15-11-10, 22:32
that sounds reassuring... can you buy them new or reconditioned from a diff shop you reckon ?

HART TRANMISSIONS at Brendale if you want a reconditioned LSD center supplied and fitted, give them a call.

vlwagz
20-03-11, 12:39
how much oil does the diff take??? im guessing keep filling until its up to the filler hole but i have the front up on ramps at the moment and cant get it off until i have oil in the diff.

Rollin
21-03-11, 05:10
[/COLOR]how much oil does the diff take??? im guessing keep filling until its up to the filler hole but i have the front up on ramps at the moment and cant get it off until i have oil in the diff.

About 1.7 - 1.8 litres man. Get 2 litres and have a little left over...

floppyjoe
27-04-11, 09:57
how do u install a minispool

Psi_Wagon
27-04-11, 18:47
look in the technical section, there is a -how to- thread

5spdvl
05-05-11, 12:34
Looks like Harrop now stock a fairly extensive range of Holden applicable diffs, in various splines; including VL/BW78 28 and 31 spline!

Harrop Diffs (http://www.harrop.com.au/drive_detail.php?prod=99-TTRC10368-00-31SPL)

VL/BW78 31 Spline (http://www.harrop.com.au/drive_detail.php?prod=99-TTRC9837-00-31SPL)

RB2GO
12-10-11, 11:57
Everyone who has broken one of these diffs, what has been the cause/results?

Interested

NZ EVLHSV
12-10-11, 12:27
Everyone who has broken one of these diffs, what has been the cause/results?

Interested

I snapped an axle changing from 1st to 2nd in a straigh line on the streets

RB2GO
12-10-11, 12:34
Sweet thats the sort of info im after, cheers

Interested in trying to iron out all the dramas these things have

Mainly interested in gear failures, if anyone has had any?

Had the bearing caps moved or bolts broke? Bent tubes etc to cause it

5spdvl
12-10-11, 13:54
There is a few pics floating around of twisted suspension mounts and torn axle tubes RB2GO (I'll try to find them); it was under a Torrie with an RB30ET from memory. I've been told the pinion is the weak point, but IMHO I haven't seen one go, and it is the age of the diffs that is causing failures in the housings themselves, as well them not being properly reinforced for big power.

---------- Post added 12-10-11 at 15:14 ----------

Here, courtesy of CT user LJ RB30. From what I can see, it broken the weld on the LHS axle tube, which has then allowed all the LHS suspension to go wherever it wanted. RHS lower trailing arm has stayed on, and wrapped around the RHS axle tube; whilst the LHS lower trailing arm rear bolt has probably snapped. From memory this isn't the first diff LJ RB30 has had this happen to.

http://i259.photobucket.com/albums/hh282/LJRB30/The%20Torana/RIMG0067.jpg
http://i259.photobucket.com/albums/hh282/LJRB30/The%20Torana/RIMG0069.jpg
http://i259.photobucket.com/albums/hh282/LJRB30/The%20Torana/RIMG0070.jpg

LJ RB30
26-10-11, 17:18
Hi ,
This was the first housing i broke but not the last!

The second housing was cut down by Final drive (thanks guys), i cut the first down myself many years ago.

They fully welded the tubes for me even tho Phil said he doesn't usually do it.

After a couple of drag meets i had the car on the hoist and noticed that the lower mounts were twisted WTF. I ordered some mounts from McDonald Bro racing (4mm thick as opposed to 2.2mm original LJ mounts).

When i removed the diff to have the mounts fitted i then noticed the plug welds were cracked on the RHS and BOTH full tube welds were cracked WTF!!!!!!

Housing No3!!!!! still has fully welded tubes but slightly different than before & heavy mounts.

I started (1st housing) with adjustable top & bottom trailing arms, solid front mounts (rodends) & Nolathane rears.

2nd housing same except rubber bush in top diff mount.

Now No3!!! im fitting stock (& boxed) lower arms with rubber bushes.

So only non rubber bush is the upper front as its still adjustable.

Won't know how its gunna go for a while cose i've give up on the R33 piece of **** gearbox & bought a TREMEC TKO600 so i gotta fit that!

Sorry bout the long rant

5spdvl
26-10-11, 22:38
Maybe the LJ suspension design is directing turning or twisting force into these spots? Have you considered redesigning your suspension?

LJ RB30
27-10-11, 18:23
Just going to try the rubber bushes first in a hope it will be abit more forgiving on launches. Dont want to get to get to carried away redesigning suspension. But who knows?


Maybe the LJ suspension design is directing turning or twisting force into these spots? Have you considered redesigning your suspension?

vl396
17-04-12, 10:26
does anyone know if it would be alright if i cut down vn/vp 28 spline axles to suit my vl commodore? ive heard its about 18/19mm overhang each side and the the spline is 40mm long , will it be alright to fit into the 28 spline centre?

thanks

5spdvl
17-04-12, 11:27
Some people have, others won't. I wouldn't recommend it.

vl396
17-04-12, 12:03
Some people have, others won't. I wouldn't recommend it.

why is that?

Rollin
17-04-12, 12:14
does anyone know if it would be alright if i cut down vn/vp 28 spline axles to suit my vl commodore? ive heard its about 18/19mm overhang each side and the the spline is 40mm long , will it be alright to fit into the 28 spline centre?

thanks

Exactly what i have running in mine at the mo with a LSD centre.

VL ones were too hard to come by and you had to pay $$$ for them!!

I havent had any isues with mine in the year or so Ive had them... :)

You will have to get the axles resplined tho as there isnt enough left after cutting them down...

vl396
17-04-12, 12:17
Exactly what i have running in mine at the mo with a LSD centre.

VL ones were too hard to come by and you had to pay $$$ for them!!

I havent had any isues with mine in the year or so Ive had them... :)

so did you just machine the 18-19mm or so off and put them in?

Rollin
17-04-12, 12:20
so did you just machine the 18-19mm or so off and put them in?

the guy before that i got the diff off did. then made a mess of trying to respline with a grinder!! i just finished them off properly...

vl396
17-04-12, 12:21
and also Rollin since your in nz also , i dont suppose you know anyone selling a vl v8 diff?

Rollin
17-04-12, 12:25
and also Rollin since your in nz also , i dont suppose you know anyone selling a vl v8 diff?

nah, sorry man. rare as hens teeth. i ended up buying a wagon diff and swapping all the insides into my 25 spline sedan diff. best way i could work it on a budget.

5spdvl
17-04-12, 13:37
so did you just machine the 18-19mm or so off and put them in?

No, because as Rollin said the splines are then to short. The axles need to be resplined so that they're the right length. I personally wouldn't do it because my understanding is they need to be heated up, which can fatigue the metal. New axles can be sourced for $660/pair last time I checked (although that's here in Victoria).

Rollin
17-04-12, 13:41
No, because as Rollin said the splines are then to short. The axles need to be resplined so that they're the right length. I personally wouldn't do it because my understanding is they need to be heated up, which can fatigue the metal. New axles can be sourced for $660/pair last time I checked (although that's here in Victoria).

You're looking at 400$ per axle here in NZ. Thats if you can manage to find them. :mad:

Try steelie gears in Aucks man. From memory they do like a 1500$ trade in for a 28 spline ready to bolt in to your car...

5spdvl
17-04-12, 15:49
Ouch! I wonder what the shipping wouch be on a pair of axles from Melbourne to Auckland? Surely less than $1500 total?

Paul.s
22-04-12, 09:47
I have vn ss diff a stock vl diff an a 28 spline salsbury diff. If i put the vn centre in the vl housing will the 28 spline salisbury axels go in aswell?

5spdvl
22-04-12, 11:24
No. VN axles are longer than VL ones as the housing is wider.

Paul.s
22-04-12, 13:32
Ill explain it Better. im gonna take the vn centre out an put it in the vl diff. My question is will the 28 spline axels out of a vc salisbury go in an fit right in a vl borg warner housing with the vn centre.

5spdvl
22-04-12, 13:59
No. AFAIK Salisbury axles are completely different; different bolt pattern (NOT stud pattern), probably a different spline count, and probably different length and/or diameter.

Psi_Wagon
23-04-12, 07:51
worth a try, and tell us how you go. ive never tried before. the salisbury's are a bit narrower but from memory its only about 10mm, you might get lucky!

5spdvl
23-04-12, 13:28
By all means try, not saying you shouldn't. I just don't think it will.

Paul.s
23-04-12, 15:37
Ill see what happens then an get back to ya.

jbonez
24-04-12, 23:11
Do you think there would be enough room to mount this into a vl?

I guess the bracket with the bearing welds onto the diff & the others onto your chassis

http://thorbros.com/files/watts.jpg

5spdvl
25-04-12, 12:47
You could do it either way man. Probably best to put the pivot point on the chassis, and the brackets either side of the carrier. That way you're not stuck with using the diff cover as a load bearing loint, and it's diff centre is still accessible without pulling half your suspension out.

Where's that kit from man?

jbonez
25-04-12, 12:55
http://thorbros.com/4-link-kits/thorbecke-brothers/watts-link-universal-kit

I think that kit is more to put the bearing on your diff.. it would bolt out easy enough from the brackets supplied

---------- Post added 25-04-12 at 12:57 ----------

It all looks too easy providing there is enough space

xAsh-
25-04-12, 15:04
Is that a watts link kit? Have a look at this kit as well before you decide

http://www.griggsracing.com/product_info.php?products_id=575

They get great reviews on the mustang forums

jbonez
25-04-12, 15:10
Yeah it is a watts link kit..

I guess alot of people think its not a good idea to use the diff cover as a mounting point.. due to it being a weakpoint.. unless it was a custom cover maybe have alot more strength

here is another style actually welded onto a commodore, I think these style of kits are around $1000

http://www.brads.co.nz/wp-content/uploads/2009/07/016.JPG

---------- Post added 25-04-12 at 15:12 ----------

http://www.msfracingcomponents.com.au/site_files/430/Watts%20linkRX7%20original.jpg

heres the kit in question

5spdvl
26-04-12, 07:42
You could easily use that first kit without mounting it to the diff cover I reckon. Does it have adjustable arms? Doesn't look like to me (haven't checked the link, on my phone).

jbonez
26-04-12, 18:52
They are threaded rods with adjustable ends (say adjustable 1-2" maybe)

I was thinking of going 9" with watts link bolt on it probably a stronger option down the track and not spending a heap on a borg warner setup when the 9" is superior

then all you have to do is get the ford setup & make some brackets for the chassis

---------- Post added 26-04-12 at 22:01 ----------

The only thing wrong with the universal kit is no height adjustment on the bearing I guess

gold-vlt
22-05-12, 21:50
does anyone have any info on what i need to do to (or if i can) put a 28 spline lsd centre out of a VQ statesman irs diff into my vl wagon diff housing?? and yes i have 28 spline vl turbo axles to suit. i plan on bolting the vl 3.45 gears onto the vq centre too.

MxPx VL
24-05-12, 14:02
Yeah should all be interchangeable.

5spdvl
24-05-12, 17:42
Yes

gold-vlt
24-05-12, 17:46
i was wondering how the centre goes in as vq irs centres dont have bearing caps like a vl diff. i guess i'll just put it in and use the old bearing caps from the vl open diff centre and bolt them over the vq lsd with new bearings

jbonez
08-09-12, 12:37
Can somebody tell me where to purchase a new 3.91 gearset

for bw78?

thanks

---------- Post added 08-09-12 at 12:38 ----------

Can somebody tell me where to purchase a new 3.91 gearset

for bw78?

thanks

vl4skids
08-09-12, 13:43
You should be able to get them from vpw and their prices should be pretty competitive

jbonez
08-09-12, 21:34
They only list vt-ba on the interwebz

5spdvl
10-09-12, 21:17
G&J Diffs in Dandenong were able to supply with new stock, otherwise there's a few Melbourne based shops that can do it I believe. Shipping might be a bit average due to weight.

boostin01
19-10-12, 22:07
G&J Diffs in Dandenong were able to supply with new stock, otherwise there's a few Melbourne based shops that can do it I believe. Shipping might be a bit average due to weight.

according to my research, 75 and 78 series gearsets are nolonger manufactured?

5spdvl
20-10-12, 09:43
Haven't looked into it for a few years, but I guess it's possible. 9" might be your only choice.

Tony1983
24-02-13, 15:34
Some bloody good info on this page for background on the diff... I've been looking for new gears for my diff, and have found the following stuff for others looking to change their diff ratio.

If ordering from the states, they call the BW78 the Borg Warner 9 bolt. Ebay is a bit light on for options, particularly if you're looking for 3.91 (I'm trying to steer clear of the 3.89). There are both aftermarket ones being sold, and second hand ones available from other websites.

For aftermarket ones, you can buy them online at:
http://www.transgearsdiffs.com.au/diff-specials.html
They're asking $600

For second hand ones, I've found them at:
http://www.9bolt.com/gearsets.html
They're prices are between $150 and $300ish depending on ratio

As I haven't tried the 3.9's before I'm thinking try the 2nd hand ones. It I like them, drive them till they break then buy the aftermarket. If I don't, then I haven't spent that much anyway.

Thought that might be helpful to someone else.

boostin01
24-02-13, 21:47
Some bloody good info on this page for background on the diff... I've been looking for new gears for my diff, and have found the following stuff for others looking to change their diff ratio.

If ordering from the states, they call the BW78 the Borg Warner 9 bolt. Ebay is a bit light on for options, particularly if you're looking for 3.91 (I'm trying to steer clear of the 3.89). There are both aftermarket ones being sold, and second hand ones available from other websites.

For aftermarket ones, you can buy them online at:
http://www.transgearsdiffs.com.au/diff-specials.html
They're asking $600

For second hand ones, I've found them at:
http://www.9bolt.com/gearsets.html
They're prices are between $150 and $300ish depending on ratio

As I haven't tried the 3.9's before I'm thinking try the 2nd hand ones. It I like them, drive them till they break then buy the aftermarket. If I don't, then I haven't spent that much anyway.

Thought that might be helpful to someone else.

if u ad in postage u may as well just buy them in aust

there would be sfa differance in performance between 3.89 and 3.91

why avoid 2nd hand bw gears? even flat-changing or transbrake abuse i cant see new ones being any stronger...

Tony1983
26-02-13, 20:17
if u ad in postage u may as well just buy them in aust

there would be sfa differance in performance between 3.89 and 3.91

why avoid 2nd hand bw gears? even flat-changing or transbrake abuse i cant see new ones being any stronger...

True about the postage, and about the 2nd hand gears. I ended up finding 3.91 on ebay. Wasn't after them for the performance,, I was after them because they are stronger and don't whine like a bi****.

5spdvl
27-02-13, 07:06
3.89:1 have the noise problem.

I picked up new 3.9:1 from G7J Diffs in Dandy for around $660 3-4 years ago.

HTURBO
27-03-13, 01:28
Just wondering do differentials wear out. The calais turbo is doing single peggers LOL. Does it need to be reconditioned or can you adjust it. Can you change the oil to help. Any help would be much appreciated.

5spdvl
27-03-13, 09:16
Yes mate, diffs do wear out, especially the OEM diffs. Clutch cones eventually wear down, making them single. Oil won't help much. You can get them rebuilt, and shimmed tighter, but at the end of the day they're a pretty crap LSD.

HTURBO
29-03-13, 18:58
Yes mate, diffs do wear out, especially the OEM diffs. Clutch cones eventually wear down, making them single. Oil won't help much. You can get them rebuilt, and shimmed tighter, but at the end of the day they're a pretty crap LSD.

Wicked, thanks 5spdvl:):):)

Be-Hating
31-05-13, 09:55
Hey. Read through the aritcle but still unsure. I have a mate who has a 3.9 ratio lsd diff thats out of a vr. Currently the whole diff is bolted in his vl wagon. Question is if i take the 3.9 centre out will it fit in my vl diff using my vl axles given they're both 28 spline?

5spdvl
31-05-13, 10:21
Centre - yes. Housing - no.

Be-Hating
31-05-13, 10:44
Yeah. I just needed to know because I wanna use vr 3.9 lsd centre in my vl housing and use my vl axles.

Be-Hating
03-06-13, 08:51
Just another question. If i put the 3.9 ratio centre in my diff that currently has 3.45's will i have to change the 3.45 pinion shaft over with the 3.9 one?

5spdvl
03-06-13, 10:56
Yes. A gearset is made of the ring gear and pinion gear, which are a matched set.

Be-Hating
03-06-13, 12:00
Ok. cheers man!

dinch
03-06-13, 16:41
Ok pplz where can I source some 4.11 from for cheap any help appreciated
Don't want em for free but don't wanna pay $600 either
Thanks

5LEEPR
26-09-13, 17:25
G'day people.

I am currently onto a seller from Street and Strip gears in Melbourne and am bout to purchase some gears for my vl.

I was under the impression that vl's ran the 78 series BW.
They are telling me that they are 75 series BW and are quite sure.

I know this thread states on the very first page that they are 78 series but i just want to make sure and find out if it is possible to run 75's in a 78?

I need an answer from someone experienced!

There are way too many contradicting threads in here.

Cheers,

Steve

5spdvl
28-09-13, 21:01
Borg Warner 78 series, and nothing else. I'd suggest the person you spoke to is new/doesn't know what they're talking about, because S&S are pretty good.

4.11:1 gearsets came in the Pintara. Read the thread. Where do you usually get old car parts from?

gold-vlt
07-10-13, 09:24
Does anyone here know what kind of power you can put through a standard spec vl turbo diff with 3.45 gears, using a manual gearbox, without risking any breakage or twisting axles?? I had my wagon diff rebuilt with a std lsd and 28 spline axles and i'm looking at putting about 500-550hp though it. I'm considering selling up now and building something stronger to handle more power.

3lturbo
07-10-13, 18:46
Does anyone here know what kind of power you can put through a standard spec vl turbo diff with 3.45 gears, using a manual gearbox, without risking any breakage or twisting axles?? I had my wagon diff rebuilt with a std lsd and 28 spline axles and i'm looking at putting about 500-550hp though it. I'm considering selling up now and building something stronger to handle more power.

500hp will be sweet, but i if you build a tougher diff now you wont have to worry about it later on. I've got a mate running around 600rwhp on a mild tune, and it's still going strong after a lot of abuse.

gold-vlt
07-10-13, 20:46
500hp will be sweet, but i if you build a tougher diff now you wont have to worry about it later on. I've got a mate running around 600rwhp on a mild tune, and it's still going strong after a lot of abuse.

Yeah, that's what i'm thinking of doing. Otherwise I could be destroying a perfectly good diff that could be of use to someone else.

I had the housing and backing plates on it sandblasted and powdercoated satin black, used vlt axles with brand new bearings, brand new pinion and carrier bearings, mint 3.45 gears and low k lsd installed. rebuilt calipers, new discs, braided lines. None of it used yet.

Not sure what I could sell it for. I'm tossing up whether to transfer all the internals into my sedan's diff and then rebuild the wagon bw 78 with 3.7's, kaaz lsd and 31 spline axles or go all out and build a 9" for it. Possibly go mini tubs at the same time :p

5spdvl
09-10-13, 16:32
Up to $1000.

EVLRB30
09-10-13, 18:43
Does any one know of any aftermarket gears for the 78 series or atleast something stronger than the std gears,

5spdvl
09-10-13, 20:58
I've only ever been able to find new standard sets, but that was at least 3 years ago. You could get a set made out of a stronger material, but it'd be expensive (unless you organised a group buy).

EVLRB30
09-10-13, 21:50
I've only ever been able to find new standard sets, but that was at least 3 years ago. You could get a set made out of a stronger material, but it'd be expensive (unless you organised a group buy).

Yeah you can still by new sets but the price is redicilous, I don't know why no one makes them because there is a market for them,

Bt1Cal
09-10-13, 22:09
Just a question.. does anyone know if there is such thing as a 25 spline 4 pinion LSD that came out in the 78 series? either in commodores or fords etc?

gold-vlt
09-10-13, 22:22
Just a question.. does anyone know if there is such thing as a 25 spline 4 pinion LSD that came out in the 78 series? either in commodores or fords etc?

Yeah na calais's and berlina's had them where optioned I think. should be on the first pages of this thread.

5spdvl
10-10-13, 07:03
It is, have a read.

And yes, there would be a market. They were $660 new a few years back.

morhiusvz
15-08-14, 09:54
when swapping from disc 25 to 28 spline centre and axles,
Is it just a matter of unbolting the old and bolting in the new one?
not changing gearing or pinion.

MxPx VL
15-08-14, 11:18
Even if your new centre has the same ratio ring gear, you have to make sure the gear tooth contact is correct and also the correct amount of backlash, also take note of the first post in this thread, the bearing cups are larger for the 28 spline axles.

http://www.supermotors.org/getfile/254827/fullsize/GearPattern.jpg