Thanks for this discussion, it's something that I've been meaning to address with my car, same T56 box but with (so i've been told) the Nissan 4.3:1 diff.
I don't mind the busy box on the road really but my main issue is on the track as a shift to 5th is needed half way down the straight to stop the rev limiter bouncing on redline. I've enough to do screaming into turn 1 without getting that shifter across the gate to 4th and as I've done, grabbing 6th instead....makes for a whole lot of footwork without engine braking
Anyway, having discussed going to a 3.something diff with a few guys, something that was mentioned was a loss of low to mid range torque with my Trickflow topend engine mods.
Thoughts?
The consensus seems to be a 3.7:1 may be the best compromise.
Any suggestions on where's the best place to source Nissan diffs?
Cheers