Ford has done this themselves so I don't believe it is a big problem to get it to fit or work. However......... I think that you probably should also have the transmission out of a Lightning as it is a heavier duty unit than you have in your Expy. It is a beefed up 4R100 that has many components that they use with the Powerstroke Diesel. By the way, I love my Lightning. It really is quite an impressive piece of machinery!!!!