Re: Parts swapping...84\' to 79\'
Assuming the 79 is fixable, sell the 84 for as much as you can get and fix up the 79. Not much will swap and what will, you don't want. The 400 is a whoops motor, but the rep is worse than reality. It can be made to run pretty good. However, the better solution is to leave the 400 alone until you find a 460. The 460 will drop right in and bolt up to any transmission a 400 is bolted to. You also may have an NP205 transfer case which you would not want to swap out. Parts are plentiful for the dana 44 and you should be able to fix it pretty easily, and for whatever you get for the 84.
Good luck, george.