Re: shifting problems
I don't know if the newer Explorers have some sort of electronically controlled throttle valve on the tranny or not but that would be my best guess. On older vehicles, there is a TV cable running from the throttle body to the tranny that controls line pressure and kickdown depending on the position of the accelerator. It sounds to me like whoever removed the throttle body and cleaned it messed up the adjustment. If out of adjustment, it will cause the exact problems you're describing.
Simple problem to fix, as long as there's no damage to the tranny.....which can happen when the valve is out of adjustment.
1992 Ford Bronco
E4OD- B&M Stage 2 shift kit
Full 3" stainless Bassani Exhaust
32" BFG's/stock suspension
"No replacement for displacement."
"Our lugnuts require more torque than most Honda's produce!"