I don't believe the trans in your 5.4L Excursion has the same innards found in the 7.3L diesel 4R100's or the Gen 2 Lightning 4R100's. And if I'm correct, and the innards are different, the Lightning engine will make quick work of the innards of your Excursion transmission.

The only difference between the diesel 4R100 and the Lightning 4R100 is the bell housing mounts. They both share the beefed up (compared to the other 4R100's in other vehicles) internals.

Hopefully Mark Kovalsky will see this thread and add his extensive knowledge to the discussion.

Stewart