The trans is close to the Landcruiser trans A442F (AW450 in the Fuso) and the Landcruiser transfer case is (nearly) a bolt up. A few guys are running the mitsu 4D34 in the cruisers, google search Landcruiser 4d34. Now I think the Jatco trans might be a bolt up for the Gen 2 Montero transfer case but i've yet to confirm, either way the big Montero transfer case has a medium duty truck pattern of some type.
The swap is pretty doable and the wiring is really simple, I wouldn't put it in a gen 1 4 cylinder truck unless you plan on doing a SAS or complete Gen 2 front suspension and axles because the torsion bars won't hold the weight and the axles will explode like they were already broken.