After removing fins and part of the PML pan bottom, the pan will go on but the exhaust then sits right on the transmission pan , which is very bad. High volumes of cool transmission fluid equate to long transmission life. Both pans fit the same applications with the same exceptions. In the past, the mediocre four speed transmissions were the inherent weak link for the powertrain.
TDR had an article testing these pans and I believe they only dropped the transmission temps by degrees F. Built from durable aircraft grade aluminum, this pan holds quarts more than your stock transmission pan. Transmission Pan , Dodge 68RFE , 545RFE, 45RFE Low Profile, Cut-Out, As-Cast. L trucks with the 68RFE transmission would see heavy towing use and increased fluid capacity would be a benefit. PML transmission pans feature sand-cast aluminum construction with raised fins, thick walls to add strength to the transmission case, and a machined gasket surface for a secure seal.
This pan fits both and wheel drive trucks. PML makes four pans for the 68RFE , 45RFE, 5-45RFE, 65RFE, 66RFE, 68RFE transmissions. All fit the transmission and the different designs suit a variety of vehicles and applications.