Re: swap in a 4.0 from a 3.0?
it will fit right in the hole like it's meant to be there. however, you will need to change your trans, computer, wiring, engine mounts, hoses, probably radiator, throttle cable, fuel system being flex fuel, etc. none of your 3.0 parts will work with a 4.0
Krylon Fusion is for Amateurs.