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Re: Rear gear and transmission ratios of 16 valve 740 700 1989

I wouldn't worry about it at all. I recently swapped trannys from a M46 to a AW71 (B230FT) and my car has a 3.56 rear end ratio whereas the doner auto trans car had a 3.73 rear end ratio. I can't notice a problem with accel due to the slight ratio difference but the auto trans gives me lower RPMs at high speeds (like only 3000rpms at 90mph whereas it was closer to 3500 with the M46).

Swapping a B230FT into a car that originally had a B234F won't be an easy or inexpensive task otherwise. I wouldn't even consider it myself. You'ld be better off finding a used B234F, installing that and either leave it like that or sell the car if you don't like that engine.






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