i have a 98 4x4 with the romeo 4.6. it has 200k on it. im getting ready to change the engine. im thinking of a 99 5.4 swap. this is a daily driver, i pull trailers a lot. if you have made this swap please advise me if you would recomend it and if you would do it again or take another route. not looking for a hot rod and dont want to use premium fuel (super charger), just an increase with out loosing reliability. thanks for your thoughts and opinions

 

i havent done the swap, but you will need a 5.4 wiring loom, PCM, and torque converter.
read this... https://www.f150online.com/forums/ar...wap-notes.html

 

I've done it my 98 4.6 to an 02 5.4 swap is easy. No PCM or harness necessary. 4.6 harness will run the 5.4 just fine. You'll need a torque converter out of a 5.4. Mine was $110ish. You will need a tune at some point after the swap to get the full potential. I had 8k on my swap with 4.6 tune. No harm ran great just not to potential. There's some great swap notes on here. But I would say go for it. I had no regrets on mine.

 

Why wouldnt you... same gas mileage but more power/torque.

 

the sales guy SOLD me this truck because i wanted a 5.4. he kept calling with a lower price until i couldnt pass it. the 4.6 has been bullet proof, just really lacking power. i cant see spending the money & replacing it with another 4.6. just looking for conformation it works well, thanks for the posts so far