2008 Chrysler Aspen Owner Manual - Page 278

STARTING AND OPERATING 277 "1" 1st For driving up very steep hills and for engine braking at low speeds (25 mph {40 km/h} or less) when going downhill. To prevent excessive engine speed do not exceed 25 mph (40 km/h) in this range. OVERDRIVE Operation The OVERDRIVE automatic transmission contains an electronically controlled fourth and fifth (if equipped) speed (OVERDRIVE). The transmission will automatically shift from DRIVE 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 has reached normal operating temperature. 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. 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 "TRANS TEMP" light may illuminate and the transmission may downshift out of OVERDRIVE until the transmission cools down. After cooldown, the transmission will resume normal operation. 5