I agree with Big Chevy. I put my 57 3/4ton on a 81 4x4 frame. I had to shorten the frame 8.5", butt weld it, and fabricate and weld gussetts to each side of the frame. I also had to fabricate body mounts, and Core support mounts. It was a lot of put-on, and take-off, to get it right. Without the right equipment, taking the cab on and off exposes it to damage. The outcome was beautiful, but a lot of work. The only reason I did it was because I wanted a modern 4x4 and there's no aftermarket "kit" way of doing that. With all of the companies catering to AD trucks, both resto and aftermarket, I would definitly go the IFS and Open rear route with a 2wd. Just my $0.02.
