You can also drop in the Ford 2.3 Lima (around 110-120 hp, stock) with ALOT less hassle with everything that is going to be involved. The Ford 4.0 is not really a easy swap, esp. since some of the Rangers came with the stupid PATS setup, and the engine itself is quite a bit larger than the 'zuki V6 even. Have you thought about the trouble with the transfercase drop?You would be better served going with a 2wd tranny and a Sammi case IF you go the Ford route.