[TonyMann]

I have a 57 one ton and I installed 73 3/4 ton frame on my truck and it could'nt have worked out better, I cut a c shape right behind where shocks were mounted. I then removed the rotors and calipers, installed 1988 one ton rotors, put the calipers back on and a proportioning valve and a dual chamber m cylinder in the stock location with a booster and it rides, handles, steers, and stops like a 73 to 85 square body. make sure to right down any V I N or serial number you come across, most frames are numbered on the front. and make sure (most important) that you keep the wheel base the same.