Goin' through a 904

Agree with dartman, also you should get the better servos and intermediate band apply strut and they do make a forward drum piston that supports an extra disc too. Many of these HD 904's were in Taxi cabs and some trucks. Go with a good TF2 kit and a decent torque convertor too. I would also install a good trans cooler if you live in a warm climat or drive in heavy traffic.