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changing rear gears stock 287 to 392 in my 1981

by Mike
(Rochester,NY)

Purchased the 392 gears, was told that I need a spacer but none are made for this app. or switch to a 3 series from a 1980 and the new rings will bolt up to it, my question is will the 1980 differential bolt up to the 1981 batwing? any other advice would be greatly appreciated

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