2004 Jeep Grand Cherokee Owner's Manual - Page 183

STARTING AND OPERATING 183 • Vehicle speed is above approximately 30 mph (48 km/h). • Transmission has reached normal operating temperature. When frequent transmission shifting occurs while using overdrive, such as when operating the vehicle under heavy load conditions (for example, in hilly terrain, strong head winds, or trailer towing), turning off overdrive will improve performance and extend transmission life by reducing excessive shifting and heat buildup. 4th and 5th gears (Overdrive) can be locked out by pressing the O/D OFF switch located on side of the gearshift lever. The O/D OFF indicator light will illuminate to show that the switch has been activated. When the light is on, 4th and 5th gears (Overdrive) are locked out. Pressing the switch a second time restores the Overdrive function. The lockout feature is useful when towing a trailer or carrying a heavy load. The O/D OFF feature must be selected, if desired, each time the engine is started. 5 NOTE: If the vehicle is started in cold outside temperatures, shifts into Overdrive may be delayed (4.7L engines only). Normal Overdrive and shifting operation will resume when the temperature of the transmission