Burb foundation
 

Can anyone tell me if the 67-72 suberban and truck frames are the same. Can I put a burb on a c20 frame.

Re: Burb foundation
 

Welcome Aboard neighbor! The basic frame rails are the same but the body mounts are different, the rear horns are different, and I believe there is a difference in the area where the fuel tank is. Truck to Burban frame swaps have been done but it isn't a simple bolt on.
If you use the search box above and search "truck suburban frame swap" and click the 67-72 button you will find lots of posts like this one.

http://67-72chevytrucks.com/vboard/s...d.php?t=239942

Good luck!