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I would say that a 3.73 is the best, one ? (archive)
[ Follow Ups ] [ 6-series (E24) Message Board ] [ Msg. Board FAQ ]
Posted by Rob Anderson on May 20, 2001 at 14:59:13:

In Reply to: Re: Changing gear ratio posted by Rob Welch on May 20, 2001 at 12:50:16:

How do you know you have a 3.07? That is the diff that came in a car with a CR gearbox. If your car has the CR, I wouldn't go anything more than a 3.25. If you want to see what speed you would turn at given RPM take a look at the technical pages on the m535i.org website under E28. E24 is still under construction.
Rob
M535i SIG Chief Technical Advisor
www.m535i.org


225/50/16 all around. Thanks.

I have a 1984 Euro 635csi. The gear ratio is 3.07.(for the autobahn, I guess). My mechanic has suggested a 3.91:1 diff. Any comments on whether this is too aggressive? Any downside to such a large change? (I want the quicker top end speed, but I don't want to give up much in terms of drivability.) Would a switch to 3.73:1 be better. Also, what is the best source for a replacement diff? Thanks. Rob.


Whats your tire size? It makes all the differance.





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