What all do you need to do to swap a 4 cylinder engine to a 6 cylinder engine in a 1991 jeep wrangler?

Answer 1

first off you need a 4.0litre engine, go with a high output one from a 93 or 94 if you can find it, engine mounts are different along with a tranny, transfer case, beef up the drivelines and axels when you do it as well, wiring harness, look for a "totalled" jeep Cherokee with the same specs as your wrangler, ie automatic or manual tsnamissions, and find one with a tranny transfer case and engine in a triple combo, check em all out for the goods then swap it over, might take the axles and drivelines from that same Jeep you got the triple combo out of too if they are salvagable. good luck youre gonna need some time.