Can you put a 1971 chevy 400 automatic tranny in to a 1986 chevy monte carlo?

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It will bolt up to the engine, but the cross member will not work as the 400 is longer than the trans. in the 86. You will also need to make a down shift switch as the 86 trans. has a detent cable, the 400 has an electric switch. There is also the driveshaft issue.

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