I was doing a search on Internet and saw this. Not one for forums but figured I may have some input on this.
I have a small business that specializes in diesel powered ford trucks. At one time or another I have converted these trucks any which way, but only recently a 6.4 into something else.
Have a customer with a nice 06 that had a rod bolt come loose and ruin lower end. He has a 08 that I've done some nice things too and he really wanted a 6.4 for this 06.
Just some info,
A 6.0 fits in a 94-97 just fine. To make motor fit you need the auto cross member, but you do need to fab your own engine mounts. The cradle is offset on the old frames.
6.0s and 6.4s are dimensionally almost the same, other that the obvious.
You can interchange trannies on 03-10, 6.4 has 8 bolt converter vs 6 on the 6.0. The shift cable bracket is different between 6.0/ 6.4 but interchange.
6.0s are nice to swap wiring wise. There really isn't much to it. The harness is modular, in the end there are 3 plugs to connect a 6.0 to a chassis. If an auto, it has its own stand alone harness. It has 2 connections that need to be spliced into a chassis. From a wiring standpoint, 7.3s require more effort, as everything is molded into chassis harness.
On my project, I just bolted on the 6.0 mounts to the 6.4. It is/ was an auto, but used the low mile trains from donor. Changed shift cable bracket.
The 6.4 trans computer is on the trans/ tcase harness, and in the end it has one main connector up top. So that one connector gets spliced into the 2 on the 6.0 chassis harness.
I have drawn up a diagram, but won't finish this part of it until early next week.
As far as things like ac, power steering, etc, the only 6.4 accessory you can't use is the ac compressor. The 6.4 comp is longer than the old model, they bolt in same location but with the6.0 engine mounts the 6.4 can't be used.
You would use the 6.0 comp, and a 05-07 line/ manifold assembly. 03-04 won't work due to the routing of the suction line. The compactness of the 05-07 works good getting around the 6.4 alt.
The ac coil plug needs to be swapped to earlier, high side switch connector needs to be lengthened about 4 inches, and the high side outlet to condenser line needs about 8 inches more. On the coil plug, if left where it normally is you will need to trim a tiny section of the alt bracket. Or you could remove coil and clock 90 degrees counter clockwise to change where plug is. Grinding the bracket takes seconds.
Even though the6.4 ac takes a 6 rib and the older is 8, it all works fine. The forward two grooves are empty. Also the older has a larger pulley, it still works with one belt and just barely clears alt bracket. The slower pulley ratio won't effect anything negatively.
Use the 6.0 trans dipstick, and it barely gets tweaked to mount on same stud on motor as if it were the original. I welded a tab to it and mounted the glow plug relay to it, so I could remove the mess of brackets on p side cover.
Like someone mentioned the 6.4 PCM will fit in the firewall blank. It will need slight work to fit. Gas PCM is not as thick, so the bottom part of hole needs to be opened up about 1/8". But it all works better when PCM is mounted upside down, so another 1/8 needs to be trimmed so it can be bolted in. Use the 6.4 studs/ nuts to hold down. Mounting upside down puts the engine connector on left, chassis connector on right.
On the steering it will need new suction/ pressure lines for pump. I had the 6.4 stuff, so used the pressure hose, but made new inlet line. If I didn't already have would rather just make the pressure line, the 6.4 one is a mess.