Transmission swap
#1
#2
If the 1998 transmission is an E4OD, no. If it's a 4R70W, yes, but the harness may need to be repinned. Most 98's with the 5.4 had the E4OD.
https://www.f150online.com/forums/tr...ngability.html
https://www.f150online.com/forums/tr...ngability.html