I don't think the heat is caused by anything other than towing about 14k LBS up a long steep mountain road at speeds below TC lockup.
I tow frequently and this is the ONLY time I ever see the Trans get hot. Mountain passes on the highway at 50-80 MPH are never an issue.
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company.