I did it on an older (1993 I think) several years ago. One of the problems I had was the electrict engine control wiring was different. I remember taking 2 days changing (actually rewiring) wires from the 2 systems to make everything work as it should, If you do decide to do this I recomend checking a wiring diagrahm and seeing which wires to the transmissions differ. Im thinking you'll get an engine light if everything is not wired correctly to the ECM. And probably get worse milage if you run it with the engine light left on.
I'm Larry, Im retired, I live just north of Nashville TN. My truck is a 2000 Ranger with 145k miles it is a 4 door XLT 3.0 auto 4X4. I like RVing (also Ford) Motorcycles BMWs And fixing things.