Right now i have a RB20DET in my 180sx running a RB20DET box with a SR20DET auto diff thats running 3.9 gears. It has basic mods like Miens ECU, front mount with 25 turbo, exhaust etc, nothing big.
I have a couple of questions about diffs and diff ratios and what difference would each make etc.
1. What stock diffs can be change over to my car?
2. what kind of a change would i see going from a 3.9 to a 4.1 diff ratio or even a 4.3? Where would i see the differences? As in quicker acceleration, bad on gearbox etc.
3. or should i just leave my 3.9 diff ratio?
Andrew.