YotaTech Forums - Swaping half my frame.

Hello, apparently i may have posted on this site before. Sorry ive had some medical issues that messed with my memory. My question is this. My 87, extra cab 4×4 frame is rusted out (nuttin new to younz im sure) i have a newer modle tacoma frame frim about the middle of the door back, if i cut my 87 frame and get my old front half attached to the newer back half successfully is their any other issues that might give me problems? I know the springs are different and for some reason yota broke with tradition the newer truck had the gas tank filler lid on the wrong side ( I E the drivers side which i can fix no problem) but what about the two back cab mounts and the bed mounts, whell base and so forth? Do any of you all know? Plus i know where theirs a good whole frame for a 92 extra cab but its a 2 wheel drive. What kinda differences am i looking at if i go that way as far as installing my four wheel front drive train parts? Which way would be easiest and best for me to go please? Thanks!