727 Tranny Problems I Think

Well you probably know all about this. The Mopar automatics have this thing called Morning Sickness where the pump needs to fill the torque converter before you take off. Torque Converter drain back usually causes this. The so called proper way on a cold start is to start the engine, then shift it into Neutral (the pump starts pumping in Neurtal and not in Park) let the engine and trans warm up a bit. The torque converter is now full and you are good to go.

Some folks put a check valve in the outgoing side of the trans cooler line to the radiator to prevent the torque converter drain back. There is a kit from Trans Go that is supposed to help this drain back too.

And Yes as you probably know, check the fluid idling in Neutral and not Park on the old Mopars.

Hope this sheds some light on things for you . . .