interchange

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Charrlie_S said

Must use the converter for the transmission used, The input shaft changed diameter and splines the same time the crank pocket changed.

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would the 904 from the 74 Dart fit into the '61? If the OE engine is shot, the OE tranny may not be far from it.
I am thinking there could be issues as the '61 is a push button shift, but IDKFS???