I have a 1990, 2400, RWD, D21. I would like to change the differential gear so I can lower my rpm's from 2500 to about 2100 at 55mph. I understand that some Nissan RWD cars are compatable. Which ones would those be?
put bigger tires on, its easier. maybe cheaper. I put 235 75 15s on and got 2 extra miles per gallon. i think they look better but thats just me. they rub a little so maybe 225 75 15s would be better. I'm curious though, those seem like high rpms, what tranny so you have?