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Re: Will a 4:10 LSD E30 fit E28 Coupe? (archive)
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Posted by RA/Bob G. on November 19, 2000 at 23:30:49:

In Reply to: Will a 4:10 LSD E30 fit E28 Coupe? posted by Calvin on November 19, 2000 at 18:30:28:


I have a 4:10 LSD from a 325i 1987. After changing the back plate, will it bolt in a 85 coupe? Calvin

CALVIN...
A 1987 325i SHOULD NOT have a 4.10 ratio in it.Maybe in a 325IX.The '87 should have a 3.73 ratio,open or LSD.If you're sure it's a 4.10,it's a bit too low for the e24 or e28,although it WILL fit if you change the back and side plates.Your gears will be too short,and highway rpms too high.
Try for a 3.73 ratio,which adds 25% more power than your stock ratio,but leaves a decent length to the gears and not so high an rpm count at normal highway speeds.


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