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Ford Expedition 1998 overdrive on or off?

The 1998 Ford Expedition doesn't have an on/off switch for overdrive. Overdrive is a gear ratio within the automatic transmission that's engaged automatically. You control whether it's engaged or not indirectly:

* OD OFF button: Pressing the "OD OFF" button (usually on the shifter or near it) *disengages* overdrive. This forces the transmission to use a lower gear ratio, useful for towing, steep hills, or when you need more engine braking.

* Automatic engagement: When the "OD OFF" button isn't pressed, overdrive engages automatically once the vehicle reaches a certain speed and engine load.

In short, there's no "on" switch; the default is for it to be on *unless* you press the "OD OFF" button.