X-case installed into 2wd
The old man was looking into it for his 92 2-wheeler and what he found out was that he would need the transfer case (with linkage), tail parts out of transmission (he has a 5sp), driveline and crossmember. It was suggested that he find an already mated 5sp and X-case to make it easier.
Did you see the thread on the new patent from Gear Vendors for their new 3 way box with under/direct/over drive modes? I would sure look at it first - Best of both worlds for loaded and unloaded travels.