That all covers his fronts, but what about the rears?

Radish, do you have a coil or leaf rear end? Not sure what exact Gen II models you have rolling around down there. Up here, the easiest routes (as in near bolt ups) are to swap a bigger SR rear with a locker into a Gen I coils sprung. And an earlier Montero Sport (Challenger in OZ, and elsewhere?) with locker into a leaf sprung. Both are as close to bolt in as it gets. There are many past threads on them.

Big Truck: 00, 3.5, Endeavor, 5-Spd drive line in hand!
Little Truck: 87, 2.6T I/C, MT, LSDs, Tonneau Top
Her Truck: 03, 3.8, 20th Anniv, 65k
Daughter's: 06 Eclipse, Keeping it Mitsu!
FSMs: MitsubishiLinks.com