97 3500 drw I installed chevy brake cylinders [1-16in] several years ago. Pulling a 30ft toy hauler then. Using truck for a beater now. Life style change. I am going to go back to 15/16in cylinders. Rear brakes are just too sever, bob tailing . I now have a 25ft Taho, dosent weigh as much. Saved my dog, ex threatened to kill him. Now have a real nice girl friend. I am 81 years young, and life goes on. Having a real good time. BOB