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1st Gen - 1997 - 2002

4.6 to 5.4 swap

This is a discussion on 4.6 to 5.4 swap within the 1st Gen - 1997 - 2002 forums, part of the Ford Expedition Forum category!
Hi, I have à 99 expy with a 4.6l and I hier found à 5.4l from à van with The ...

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Old 04-09-2012, 01:35 PM   #1 (permalink)
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Default 4.6 to 5.4 swap

Hi, I have à 99 expy with a 4.6l and I hier found à 5.4l from à van with The computer. Can it bé bolt on to my existing transmission or do I need to find à trans ?

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Old 04-10-2012, 03:55 PM   #2 (permalink)
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I have an expedition that had the 4.6-5.4 swap done and man was it done wrong. The 5.4 computer won't work unless you get all the wiring ignition and insurer ment cluster o and the keys from the 5.4 donor. You can swap in the 5.4 and use the 4.6 harness and computer but it won't run 100% like it should and you'll be best off getting power hungry tuner and to write you custom tunes. If you have the 4r70w you'll need a different torque converter which you can source from a f150 that has a 5.4/4r70w. You my not need to do all the sensor crap I did since yours is a 99, but I believe you have the coil pack ignition still and the 5.4 has coil on plug. The swap is a direct thing if you got all this figured out and be sure you have the right radiator some 4.6 had a single row and the 5.4 had the 2row.
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