73 Dart 360 Transmission Options?

If you wanna stick Mopar, the A518 is basically a 727 with an overdrive unit attached, and the A500 is a 904 with an OD. Both of those tranny's require some cutting and reinforcing of the transmission tunnel to fit the bulky OD tail of the transmission. These can be found in Dakota's and trucks, but try to get one built before '96 (that's when they switched from hydraulic control to electronic). Some have lockup converters and some don't, I can't recall how to identify the lockup ones.