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25 or 28 spline??

Munz

Right Foot Action
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You will most likely have the BW 75 Series open centre differential with a 7.5in crownwheel and 3.08:1 ratio gear set.

VL 6 cyl (including turbo) auto and manual have 3.45's from factory. V8 had 3.08
 

K-BAGZ

De Plane! De Plane!
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VL 6 cyl (including turbo) auto and manual have 3.45's from factory. V8 had 3.08

The majority yes, but in a few RB30 NA and turbo cases that I have witnessed there has been a 3.08:1 ratio fitted.

Only simple way to tell is mark driveshaft rotation to a rear wheel's rotation.
 
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