Farm Law.... I have sucessfully disconnected the A4WD in my brother-in-laws Explorer. I removed the fuse for diagnostic purposes. It worked like a charm! I don't know if you can do this with the Expeditions though. If it does work the same, I don't see why you couldn't cut a switch into the wiring and just shut it off. It is a completely electrical system that trips vacuum solenoids which run off 12 V. Just a thought, but worth a try. You might want to consider this also..... Mine has a 2WD selection. It was offered in 97 and 98 and now it has returned in the 03's. Maybe you could find a way to retrofit this system into yours!