Ok here is one thing that might be your problem. in the Transmission there is a Small Gasket, well it is Diagonally cut so that it can be placed over a Shaft, FORD has discovered the problem, and has a Replacement gasket that is Square cut. once this gasket is replaced you will not have the problem again. I had this same problem the day I Test Drove my Used 97 Explorer Sport at the Dealership. Beacue it was still under Warrenty, they replaced it free of Charge. well i hope i have answered your questions, if you would like to know more feel free to e-mail me at CBOUG76@yahoo.com
Chris