Man you must have read my mind...or maybe my post
I was just asking on my 1980 build thread if the sub frame and the crew cab frames had the same body mounts.....by reading this I'm guessing the answer is yes?
this is very much like what I was pondering doing with the sub front frame and the short bed rear...so you used the front and mid cab mounts on the sub frame and attached the short bed frame with the rear cab mounts?
I was even thinking about cutting the sub body and mating the back of my standard cab to it to make a crew-cab....dunno how much work that would be....but the 2wd subs seem to be a dime a dozen around here with very decent bodies....
can you post some after pics of the finished frame splice?