Yes you need a new shaft...I had to do the same thing to mine. And the transfer case will fit if it's from truck that originally had a manual. If the transfer case is from an auto you have to swap the input shaft in it
Youll also need to get a new front axle and all the steering linkage along with the steering box. You could try to use the vacuum actuators for the 4wd but locking hubs would be easier. Dodge used a Dana 60 in the front for diesels and i think ford did as well so you could either get the locking hubs from a ford or vacuum for the dodge. Ford also used heavier duty knuckles if i recall correctly. Im sure theres a bunch of stuff i forgot butthats the gist of it.
if your looking to make it hold up to a bit of extra power and some abuse i would suggest maybe just buying yourself a complete overhaul kit from Home with the upgraded mainshaft
They have complete kits(not cheap), including the mainshaft (so you can swap out to a 4x4 shaft), plus they also sell the 4x4 tail housing (not cheap)
But its not going to be cheap...
If your looking for cheap, i would suggest you keep looking elsewhere for a 4x4 trans. either to use as a complete unit, or for the needed parts.
Depending on how much the guy wants for the 94, i would say you might be best off passing on the deal. It might end up costing you more to convert that trans, than it would to just pick up a 4x4 trans (not to mention that 4x4 trans would likely have your needed tcase/shaft behind it also!)
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