904 for Towing?

The 727 is a heavy duty tranny that can handle a lot more torque and abuse. Chrysler put them in trucks and vans for that reason, even in some 6 cylinder engines. 904 transmissions are good in cars and low powered trucks. They build up heat, so an extra trans cooler is recommended. See #3 post. My late 1980's 318 powered pick-up truck came with a 727 non lockup trans. from the factory. --------- I'd swap engines and keep the 727.