2009 Jeep Grand Cherokee Owner's Manual - Page 294

292 STARTING AND OPERATING left "D(-)" and hold it there. The transmission will shift to the range from which the vehicle can best be slowed down. Overdrive Operation The automatic transmission includes an electronically controlled Overdrive (5th gear for 3.7L and 3.0L diesel engine, 4th and 5th gears for 4.7L and 5.7L engines). The transmission will automatically shift to Overdrive, if the following conditions are present: • the transmission selector is in DRIVE; • the engine coolant has reached normal operating temperature; • vehicle speed is above approximately 30 mph (48 km/h); • the TOW/HAUL switch has not been activated; • transmission temperature. has reached normal operating NOTE: If the vehicle is started in extremely cold temperatures, the transmission may not shift into Overdrive and will automatically select the most desirable gear for operation at this temperature. Normal operation will resume when the transmission fluid temperature has risen to a suitable level. Refer also to the Note under torque converter clutch, later in this section. During cold temperature operation you may notice delayed upshifts, depending on engine and transmission temperature. This feature improves the warmup time of the engine and transmission. If the transmission temperature gets extremely hot, the transmission will automatically select the most desirable gear for operation at this temperature. If the transmission temperature becomes hot enough, the "TRANSMISSION