Ive looked and looked on here and cant find the exact answers I need, so here goes. I have a 98 F-150 w/4.6 4X4, 9" of lift 4.56 gears, eaton lockers, tranny built to max(only housing is whats stock, everything inside is HD to the maxx). I want more power and rather than building a 4.6 I was lookin at gettin a crate 5.4 lightning motor, Im not lookin for 400hp and stuff I just want a nice 340hp or so nothin outragous. Its still my daily driver so I want it to be a practical truck still, but I want more power done right. What exactly would I be looking at changing with doing the lightning motor, and how would my tranny coup with this mid 300's hp? Thanks a bunch guys

 

hey...check this out...
https://www.f150online.com/forums/en...-progress.html


or search Built54 and enjoy

 

yea my 98' 4x4 f150 with just under 500hp at the wheels is my daily driver... Cant tell anything is done to it unless I lay the pedal down.

 

wondering how your tranny would deal with 300 horses. first we need to know whats done to it. you dont have a power rating that came with the rebuild?

and yea...do what was said before and youll find your answer.

 

300hp is nothing for the tranny. id get a shift kit just to be sure. My stock tranny with a stall and shift kit held up to 145k miles. And I dont run my truck easy.

 

it has a stage II shift kit in it, Im not really worried about the tranny so much that I need to know what Im all gonna have to change when I do this crate motor swap. What do you mean what was said earlier? The tranny has all kinds of kolene steels some kind of thing was changed to drum, shift kit, huges torque converter(factory stall what ever that may be) and somethings are kevlar, I think it says INT clutches. I had it done last summer and it has about 10K miles on the rebuild. Can you guys make heads or tails out of any of that?

 

i think he's referring to my first post

 

The tranny has all kinds of kolene steels some kind of thing was changed to drum, shift kit, huges torque converter(factory stall what ever that may be) and somethings are kevlar, I think it says INT clutches. I had it done last summer and it has about 10K miles on the rebuild. Can you guys make heads or tails out of any of that? What motor was that he was putin in there in that link?

 

I built my own engine piece by piece.

 

anyway so can you guys just list the things Im gonna have to change on my truck so I can start to get a round about idea of how much Im gonna need for this

 

fuel pump, you'll need a custom tune for it, exhaust manifolds(or long tube headers) and have a shop do your exhaust system. thats all i can think of off the top of my head.

 

depends what you want to do.
Heads, cams, pistons, rods...

 

will I have to change any of my stock wiring harness, or anything electrical. Im not gonna change anything on the motor. What about my computer?

 

you can run your existing computer but you will need to have a custom tune

 

who would have to do the custom tuning for my computer? So I dont have to really change anything then Im guessin, what about my coil packs, and vac lines and all the little things on my motor?