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M40 rear end ratio question 140-160 1971

posted by  b4_ford on  Fri Jun 8 17:21 CST 2007
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last visit: Wed Sep 22 02:10 CST 2010
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I'm picking up a 1971 144S pretty soon that has a BW35. I have access to either an M40 or an M41. I like the o/d trannies that I've had but I'm toying with the idea of M40 and changing out the rear end. This car will wind up with The Mikuni car setup and an IPD Street Torque cam. If I go with the M40, what is an advisable rear end setup and where do I source it? I want something that will be civilised on the highway, not 4500 rpm at 75 mph. Or am I an utter fool and should I just go with the M41 and leave the rear end alone?






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New M40 rear end ratio question [140-160][1971]
posted by  b4_ford  on Fri Jun 8 17:21 CST 2007 >


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