there is some really good info in the tech library.
but on your 2.9 b2, you will be looking at a dana 28 TTB front end, 7.5 rear end, all sorts of tranny's you could have, you can till by looking at the pan and matching it to the tranny ID section in the tech library.
the info is there for the transfer case as well.
either a 1350 or a 1354, seems that the 1354 is stronger, but not near enough to attempt a swap..
being tight on cash, you can look into fender cutting, bigger tires, and fixing the little things that i know you know about!!!