You would want the whole truck it came out of. The easiest way I can think of making a 2X4 into a 4X4 would be to graft the Ranchero onto the chassis the engine comes with. Second easiest way would be to graft all the stuff for the 4X4 drive train (and suspension) onto the Ranchero. It would be difficult to reinforce the Ranchero enough that it would be what I would want to call reliable. Lotsa work either way, but I guess it all depends on what you are after. You could have a 'redneck' Ranchero, or you could lower it and have a rally Ranchero. You would definitely be the only one in the parking lot either way.
