I have a TH350 that has about 20 1/8 mile passes on it since rebuild with new internals. Tranny guy says it should be good to 600hp. It has the big aluminum TCI pan and pro tree trans brake. I also have a Redneck performance 5k stall with it. The tranny bell has a crack in it. It can probably be welded and fixed or I'm sure you could put an ultra bell on it as the crack doesn't actually get down in the case. This is for a LS1. I will sell both for 600.00OBO. It cost me 6xx.00 just to have the tranny rebuilt.