So I take it the diff is different inside, (crown and pinion), the reason I ask, is I have a 3.08 sitting in my shed out of my old XK Falcon, and yes I know a Falcon is a Ford, and not a Holden, but I modified a EH diff to fit it, the old 3.55 was way to low with 13 inch wheels,
3.55 higher reving, lower top speed, but more pick up
3.08 lower reving, higher speed, slower pick up (not really, toyota steel 5 speed, 250 xflow, 13inch wheels)
Nigel