1996 Ford Explorer not moving?

Why won't my 1996 or my 1995 Ford Explorer move in 2 wheel drive, but will in low range?

Your vehicle actually has two gearboxes linked together with a transfer case. One set of gears is used in normal driving (high range) and the other set is for low range. So it sounds to me that there's something wrong either the transfer case or the high range gearbox.

The high range gearbox is the transfercase which is also the low range gearbox. The other gearbox is the transmission.

4 wheel drive is better anyways