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Re: 1972 3.0CSI DRIVELINE CONVERSION (archive)
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Posted by Merdad on November 06, 2000 at 20:09:55:

In Reply to: 1972 3.0CSI DRIVELINE CONVERSION posted by RANDY '72C.S.I on November 06, 2000 at 16:23:17:


I recently put a 3.5 motor from a 1979 EURO 6 SERIES I OWNED in my '72 because the engine was neglected by the previous owner, i'm curious to know should i also put in the 5speed tranny,and what is the biggest rear end{gear ratio} i can use or should use with the engine & tranny and from what old bimmer?
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I replaced my engine and tranny in the CSi two years ago to a 3.5 using the existing D-Jet and a 5-speed. The five speed is a must (it makes such a difference in cruising RPM). You need to get a five series cross member and Shorten the driveshaft. I also put in a short shifter.
Since my car is a CSi, it came with 3:25 rear end and that I have been told is the best combination (correct me if I am wrong), but unfortunatly it is not a limited slip. Your 635 may have that rear end, but not sure if it fits on a coupe!

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