if thats what you want, switch out the front cross member with 71-87 1/2 ton. you will also get disk brakes with those. as far as the rear, im not so sure about spring perches and shock mounts being the same width spacing.. but 71 and newer apply to the 5 lug as well of course.. the newer the body style truck it came out of, the wider the mounts will be from each other.
