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Old 21-03-11, 05:10   #176
Rollin
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Originally Posted by vlwagz View Post
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...
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Last edited by Rollin; 21-03-11 at 05:14.
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Old 27-04-11, 09:57   #177
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how do u install a minispool
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Old 27-04-11, 18:47   #178
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look in the technical section, there is a -how to- thread
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Old 05-05-11, 12:34   #179
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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

VL/BW78 31 Spline
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Old 12-10-11, 11:57   #180
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Everyone who has broken one of these diffs, what has been the cause/results?

Interested
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Old 12-10-11, 12:27   #181
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Originally Posted by RB2GO View Post
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
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Old 12-10-11, 12:34   #182
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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

Last edited by RB2GO; 12-10-11 at 12:59.
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Old 12-10-11, 13:54   #183
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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.




Last edited by 5spdvl; 12-10-11 at 14:22.
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Old 26-10-11, 17:18   #184
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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
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Old 26-10-11, 22:38   #185
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Maybe the LJ suspension design is directing turning or twisting force into these spots? Have you considered redesigning your suspension?
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Old 27-10-11, 18:23   #186
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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?


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Maybe the LJ suspension design is directing turning or twisting force into these spots? Have you considered redesigning your suspension?
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Old 17-04-12, 10:26   #187
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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
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Old 17-04-12, 11:27   #188
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Some people have, others won't. I wouldn't recommend it.
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Old 17-04-12, 12:03   #189
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Some people have, others won't. I wouldn't recommend it.
why is that?
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Old 17-04-12, 12:14   #190
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Originally Posted by vl396 View Post
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...
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Last edited by Rollin; 17-04-12 at 12:17.
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Old 17-04-12, 12:17   #191
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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?
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Old 17-04-12, 12:20   #192
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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...
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Old 17-04-12, 12:21   #193
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and also Rollin since your in nz also , i dont suppose you know anyone selling a vl v8 diff?
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Old 17-04-12, 12:25   #194
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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.
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Old 17-04-12, 13:37   #195
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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).
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Old 17-04-12, 13:41   #196
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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.

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...
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Old 17-04-12, 15:49   #197
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Ouch! I wonder what the shipping wouch be on a pair of axles from Melbourne to Auckland? Surely less than $1500 total?
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Old 22-04-12, 09:47   #198
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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?
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Old 22-04-12, 11:24   #199
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No. VN axles are longer than VL ones as the housing is wider.
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Old 22-04-12, 13:32   #200
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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.
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