2008 Dodge Ram 2500 Pickup Owner Manual Diesel - Page 289

STARTING AND OPERATING 287 Upshifts into both overdrive gears, 5th and 6th, will be delayed when the transmission fluid temperature is below 40° F (4.5° C) or above 240° F (115.5° C). NOTE: Use caution when operating a heavily loaded vehicle in 2nd or 1st gear in high ambients as torque converter slip can impose significant additional heat load on the cooling system. Overdrive Operation The overdrive automatic transmission contains an electronically controlled 5th and 6th (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 O/D OFF" switch has not been activated; • transmission has reached normal operating temperature. WARNING! Never use Park position on an automatic transmission as a substitute for the parking brake. Always apply parking brake fully when parked to guard against vehicle movement and possible injury or damage. 5