727 fluid capacity/cooler preference

I’m not running a 727 in my cars. But we put a 727 in my buddies 70 340 Dart last summer. Just ran the external cooler and fill the trans as normal.

in my 02 Ram 2500 V8, have a 46RE, basically a 727 with OD. Stock they have a back flow valve in the trans cooler line. When I did a trans rebuild, I removed the check valve and put in a larger external cooler than was stock.

Also, think about why the manual says to get fluid warm and check in “N”. The fluid expands when hot and is moving in the system cus the pump is spinning while in “N” or gear.

just use the external cooler and not the one in the radiator.