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What does the button on side of transmission shift lever do a 2004 Jeep Liberty?

That button on the side of the 2004 Jeep Liberty's transmission shift lever is the overdrive off button. Pressing it disables the highest gear (overdrive) in the automatic transmission. This is useful for:

* Engine braking on downhill grades: Lower gears provide more engine braking, helping control speed and reducing brake wear.

* Increased power for passing or towing: Disabling overdrive keeps the engine in a higher RPM range, providing more power.

* Better control at lower speeds: Useful in situations like driving in mud or snow.

When the overdrive is off, a light usually illuminates on the instrument panel indicating that it's deactivated.