[1974ChevyC10]

not sure where to find specs on 67-72 frames but as far as lengthening your frame to add a 67-72 body to a 84 frame well since there different body styles i would think the mounting points on the bodies would be different.i also think there would be a lot of grief involved in getting a frame lengthened or shortened.my personal opinion is get a 67-72 4x4 and add your suspension stuff and motor/trans/transfer case to it from the 84.another question is if you like the 84 then how come you wanna do the body swap?