Engine Swap
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1st Gear
Joined: Feb 2026
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Engine Swap
I'm looking to swap out an engine in my 2003 Ford F-150, 4.6 litre engine, 4x4. I found a 4.6 litre engine out of a 2004 Aviator. It is a HO 4.6 litre, 32 valve. How much trouble would it be to swap? Would I need to switch the exhaust, PCM, ecm, transmission, and flex plate? I'm fairly new at this stuff, but I know my way around an engine. Any help would be appreciated.
Fleet Mechanic
Joined: Jul 2019
Posts: 1,304
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Yeah, you’d need to swap all that stuff. It’s not an F150 platform vehicle, so some wiring work will be involved. I’m sure the computer controls both that engine and the 5-speed automatic transmission, so it’s an all or nothing deal on that front.
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