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Specifically since I think you have a 5.4l now and you have a 98 already so there is no need to mess with wiring changes at all to use a newer transmission, you would be best to find a transmission out of a 98-04 5.4l 4X4 F150 that was equipped with a 4R70W. If from an 04 it needs to be from a Heritage.
Darrin
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