just about everything swaps or can be made to work 72-93. I always thought rad support mount holes was a 2wd / 4wd thing and know they used both locations in the 70s - the rad supports have two sets of holes. Only xfer case specific cross member is the divorced 205 and ya need something stiffer anyway. 2wd vs 4wd is same frame, different mounts riveted up front. 1/2 ton vs 3/4 ton check frame rail height.