How hard is it to swap 2.5 ton Rockwells or GMC axles into a '78 pickup? Would everything be able to handle the increased unsprung weight? How about hooking up the steering? If I went ahead and did it, i'd probably run 44's and the superlow gearing would help for crawling. Which is better also, the Rockwells or the GMCs? Would they be expensive from a junkyard? Thanks to anyone who can answer any of my many questions.