Preferrably the transmission and pcm if it's auto. Your pcm controls the 4R100, and it wouldn't be able to control the 3v because of the variable cam timing on them, so you'd have to swap the pcm out of the 3v, which would mean you'd have to get that to control the 4R100, which I doubt it can - you could go with a separate controller for it, but for that cost you'd be better off getting the nicer torqshift. If it's a manual, then just the pcm should do it.

The other option however would be the navigator motor swap. It's a 4v instead of a 3v, but no VCT means your computer can run the thing. Some of the sensors/and vacuum stuff might be different. They're still rated at 300/365, but they should have a much nicer torque curve than the 2v and will give the 3v a run for its money, even without the vct. And there are 2000+ hp 4v 5.4s out there, so if power you're after, there's plenty of aftermarket support there.

 

You 2004 already has pi heads on it ...

 

Don't discount the v10. If you get one with the pcm and the engine harness, it should plug right in. 01-04 will likely be the same. Not sure if the v10 uses a different torque converter or not. The pcm should be a plug and play with your stock wiring. The engine harnesses should be plug and play into the truck harness as well. Not sure about the exhaust Y-pipe. If you can find a great price on the 6.8 (and with current fuel prices I'll bet you can) then I think its a doable option. If my 6.8 ever dies, I will look for a 5.4 replacement.

I say "should" in the previous paragraph because I have researched this swap, but I haven't actually done it.

 

I would try a 3v engine, but use one of the available kits to lock the VVT. Then, you could use your existing PCM and transmission.

 

Personally I would look for a whole donor vehicle to buy and make a choice in large part on what you can get in your budget. It can get rather cheap and easy when everything you need is right as you need it but on another wrecked rig just waiting to be swapped. Then sell off what you don't use to recoup some of your money.

 

amen to that

 

not to revive a dead thread but im in the same boat. my 01 f250 with a 5.4l is a massive pos. its shot out 3 different spark plugs and ive been in process of taking the heads off to get them remachined for the last 3 months because every bolt has been a fight. i finally got fed up with it and my friend has a running carbed 460 with a c6 trans that he will sell to me for 250 so provided i can get the 5.4 out without another epic battle thats what will be going into it in the near future.
my question is i know i will have to get rid of the trans but can i make the stock transfer case work or will i have to run a divorced set up? the idea of running divorced is kind of appealing to me so taht i can possibly retainthe stock driveshafts but im open to other ideas.

disclaimer i know i will get flamed for wanting to run a carbed motor, however i dont have to meet emissions, this motor is cheap, and i like working on carbed vehicles much more than efi.
another disclaimer i know how much work it is going to be. however the truck is already a work truck with the only ammenities being a radio, AC, and a heater... i can live without AC and i can make the radio and heater work without a computer. and as far as monitoring goes i can rip out the stock cluster and put in aftermarket gauges to run it.

 

I put 460-C6 combos in all my derby cars, mainly they go in 70's to 80's caddys. Let me say by doing it the way we set up out cars takes about a week to get everything right. You might as well rip out all the wiring and everything associated with the 5.4. You will need, custom motor mounts, custom crossmember, custom driveshaft, not too much wiring in involved if you run an HEI distributor, you will need custom power steering lines, you need to re-use the 460 radiator. As for the transmission, a custom linkage will need to be made and a custom driveshaft will need to be made. Can this all be done? Yes. This will be more time and effort than just buying a used low mile motor and dropping that in. Also you need a custom fuel system. I do this swap about 10 times a year and I know what it takes.