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Old 12-30-2012, 10:48 PM
Microtesties Microtesties is offline
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Location: Concord, NH
Join Date: Oct 2012
Posts: 101
Mein Auto: 1990 BMW 525i
Originally Posted by south26 View Post
The e30, e28, e24, e23, z1, will not work. I believe the only diffs that will work on the e34 are the e34s and the e32. (maybe the e38). The 525i has a medium diff like the 535i, and 530i. I believe the output flanges on the 525i are different so you would have to change those on diffs from the other cars.
The one from the e34 540 will be different since it is a big diff like the e32.

Here is a link on diffs

Awesome link!

Looking at E32's I think I'm gonna try and go for a 3.15 out of an 88-90 750i. It should bolt right in and won't affect my ratio TOO much.

Getrag 260/5
1st: 3.84
2nd: 2.20
3rd: 1.39
4th: 1.00
5th: 0.81
Reverse: 2.09
Final drive: 3.75(stock) or 3.15(750i)
Year: 1990
Model: 525i
Transmission: 5 speed
Mileage: 250k
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