With an 02 F350 4wd PS, its my dads, the trans is on its way out I guess. He called me and said after he installed his superchips tuner after a ~50 miles he got on it hard and now it wont shift out of 2nd and the O/D light flashes. He has a 4R100 right? Who is a good aftermarket built trans builder that he can order one from and not have any problems anymore? Also what is a good Ford truck forum that I can ask for him on?

Brians Truck Shop. Bullet Proof when they get done with it.

I don't know any good PSD forums, sorry.

If you haven't found a good diesel forum yet, I have heard "thedieselstop" is good. I don't know first hand, but it's worth a shot if you need some help.

Get one from Jasper they have the best nation wide warrenty. The Jasper also comes with a upgraded converter. I have installed a lot of them with no problems.