2001 Ford F-250 SD transmission problems

Consumer was traveling on highway, and there was transmission fluid leaking from under vehicle. Also there was a fire under hood, in which consumer believes started with the transmission problems prior. Consumer had problems with transmission, the first dealer could not duplicate the problem, consumer decided to take the vehicle to another dealer for the second opinion, while on his way to the dealer, vehicle caught on fire.

As I was driving my ford f-250 sd taking my child to school, there was a loud bang and the truck felt like it hit a brick wall. It would only do this when shifting out of 2nd gear. Powerstroke with a 4r100 transmission. Dealer states that the drum or "mechanical diode" has went out, so they replaced with a "sprague diode", at a cost of 1500.00. There have been numerous reports of this "mechanical diode" breaking due to ford using bad parts. I called ford and ask for reimbursement, but was denied.