Diff ratios

[damianison]

Can someone please tell me if there is a difference between a 3l auto calais diff, and a 3lman berlina diff. (other than obvious casing differences and discs).
I have just got rid of the slushbox in my calais (thank god) and have put the 5 speed in, and running the original diff. Have been told by someone that wasnt really sure that my auto diff is prob taller.
I want to know if its worth swapping the diff heads over.
Cheers

[VL Berlina 5speed]

yah i was tolld this by a mate to0, when i went auto to manual, is this true???

[bangers]

the ratio is the same between auto and manual.

[STEALTHY™]

what he said. Stock they are 3.45s. Good upgrade is to 3.9s, or even the 4.11s out of skylines (as in the Square 31s)

[VL Berlina 5speed]

what he said. Stock they are 3.45s. Good upgrade is to 3.9s, or even the 4.11s out of skylines (as in the Square 31s)

are these a straghit swap from cube car (r31) to vl, coz i could get a full rear cheap, proberly from u pull it

[STEALTHY™]

are these a straghit swap from cube car (r31) to vl, coz i could get a full rear cheap, proberly from u pull it

i'm not 100% sure, but i had a few mates go hunting for 31s at U pull it, so i assume they bolt straight up (you'd think that anyway having the same driveline)

Also something i think worth mentioning, the V8 would have a different ratio, lower like 3.08 or even lower again.

[stateo 304]

auto r31 skyline=3.9
manual r31 skyline=3.7
auto/manual r31 pintara=4.1
auto/manual=3.45

diff gears bolt straight in not to sure about the whole center

[SUSPECT]

ill have 4.11's ssooon enough cant wait eheh so im told it makes a hell of a differece

[1991_Vn2nV]

i'm not 100% sure, but i had a few mates go hunting for 31s at U pull it, so i assume they bolt straight up (you'd think that anyway having the same driveline)

Also something i think worth mentioning, the V8 would have a different ratio, lower like 3.08 or even lower again.

5.0L is a 3.08 ratio... same diff as the VN, 4 pinion 28 spline... Although the diff is not actually as wide..

[ucwepn]

Damn double post.

[ucwepn]

5.0L is a 3.08 ratio... same diff as the VN, 4 pinion 28 spline... Although the diff is not actually as wide..

Thats right for the 5.0l, the VL 3.0 non turbo has the borg warner 2 pinion 25 spline with 3.45.1. Same diff as r31 and same diff as some falcons.

I am keen to get the 3.7 gears as this would help acceleration without losing too much top end.