If you Montero is a four cylinder, you don't need to worry about swapping the whole axle assembly. Much quicker and easier to drop the third member out of the truck and put in the Montero unit. That way you keep your truck axle housing and get set-up lower gears from the Montero.

1994 3.0L 4x4 pickup.
4.62 gears (4.22 stock), 33x10.5 BFG MTs. LSD rear. Five speed trans. 172K
Previously owned Mitsubishis:
1986 2.6L 4x4 Mighty Max, 1985 2.6L 4x4 D50
1987 2.6L Raider, 1989 3.0L Raider
1995 Montero SR