91 Suburban to 78 frame will it work

[skevac]

I'm looking at buying a really clean 1991 GMC Suburban two wheel drive but with me being a four wheel drive guy I would like to put it on a four wheel drive chassis. I have a 1978 four wheel drive Sub. frame. My question is will the 91 body bolt on the 78 frame ( are all the body mounts in the same position & etc.) I know the trans tunnel would have to be changed. What other issues would be encountered. Also would it be easier to add the four wheel drive front axle components to the 2wd frame. I have lots of donor trucks and can do most of the fab myself so these aren't issues. Just looking to see what hidden issues I might be getting myself into? If this would be better suited in the FWD section mods please move.