What is the proper gear to drive a 1999 Eddie bauer ford expidition in?

On a 1999 Ford Expedition :

Overdrive is the normally allowed position

It won't shift into overdrive ( the 4th " gear " of the transmission ) until the speed is higher anyway ( such as on a highway / freeway )

If you are towing something / or driving in hilly country and the transmission

is shifting back and forth between overdrive and drive , then you want to shut off the overdrive on the transmission using the switch on the end of the gear selector lever . ( the Word OFF will light up near the end of the gear selector lever )