V8 lsd diff to VT V6

[CuRt007]

Before I get my nuts ripped off by all the members on here i have tried searching several times, however, it was to no avail.

Does anyone know whether a V8 LSD diff from a VT-VY will fit my VT series 2 executive (5 speed if that makes any difference)?
Is it a straight swap?

Forgive my lack of knowledge

Thanks

[sly_gen3]

Only a diff from vt series 2 backwards will fit. Anything newer has a different pinion, unless you want too change tail shafts aswell.

[jazza15]

Only a diff from vt series 2 backwards will fit. Anything newer has a different pinion, unless you want too change tail shafts aswell.

He means (from the vx onwards i believe) that if the tail shaft flange is the same as yours (metal), then yes it will bolt straight in, if it is a rubber one (three bolt triangle shaped, with rubber donut) then you will have to change your tail shaft or diff flange, both of which may be a bit difficult.

Also the V8 diff from VT onwards had a 3.07 ratio as opposed to the V6 NA and supercharged ratio of 3.08. Not much of a difference at all, but it will be interesting to see if it has any effect on the speedo accuracy.

[CuRt007]

Thanks guys
So in terms of installation times, what am i looking at?
Is it a difficult process?
What about gear ratios are 3.9s too high?

[holden boy]

it dosn't take 2 long if you have all the correct gear 2 or 3 hours max if you are fairly decent with tools .
or even less if you are good .

[feg]

I think 3.9 would be a big step, and you may have to get your cluster re calibrated, with a tech 2? someone else on here would be able to confirm that possibly.

[ducker85]

He means (from the vx onwards i believe) that if the tail shaft flange is the same as yours (metal), then yes it will bolt straight in, if it is a rubber one (three bolt triangle shaped, with rubber donut) then you will have to change your tail shaft or diff flange, both of which may be a bit difficult.

Also the V8 diff from VT onwards had a 3.07 ratio as opposed to the V6 NA and supercharged ratio of 3.08. Not much of a difference at all, but it will be interesting to see if it has any effect on the speedo accuracy.

isn't it VT 2 onwards because when they went the gen 3 they all changed the pinon or something from 7 to 8 spine kinda thing

[Vt_vic]

3.9 are great for an auto prolly the best bang for buck mod on a 6