I run a Torqueflite from Protrans. Its a killer piece. Billet input and output shafts, no stock internal in it. It was 1/3 the price of a similar TH400. I have put over 50 passes on it. I leave at 12 psi of boost which is good for just over 1,000 hp and probably similar torque since I leave at 4800 rpm. Zero problems with it.So far my 3400# car has gone low 8's with this combo.