I have a 1972 f-250 thats a 2wd and I found an 81 f-150 thats a 4wd for a descent price and I'm curious to know if the body would line up with the newer 4wd frame?

 

The body mounts will need to be modified to make the body fit. If you want to make it 4wd, I would look for a 77.5 - 79 frame. The body should bolt on to the 73-79 frames with a problem, with the 77.5-79 F-250/F-350 frames being the best match so you do not have to drill new hole in your box.

 

Alright, thanks for the info.