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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?

Thanks Nick
 

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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?
 

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It is a 5 speed manual transmission. I can get the gears for a few bucks, might even be able to get a limited slip unit. The rest should be fairly cheap (seals etc.).

The RPM is according to the factory tach, it could be off a little.

4th gear is 3000 rpm at 55
5th gear is 2500 rpm at 55

Nick
 
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