Dodge 2010 Ram Truck Chassis Owner's Manual page 226

224 STARTING AND OPERATING
• the engine coolant has reached normal operating tem-
perature;
• vehicle speed is above approximately 38 mph
(61 km/h) for fifth gear and 50 mph (80 km/h) for
sixth gear;
• the "TOW HAUL O/D OFF" switch has not been
activated;
• transmission has reached normal operating temperature.
NOTE: If the vehicle is started in extremely cold tem-
peratures, the transmission shift schedule initially re-
stricts transmission operation in forward gear ranges to
third gear until the transmission fluid temperature rises
to a suitable level. During this condition, the ability of the
vehicle to accelerate under heavily loaded conditions
may be reduced. Refer to the "Note" under "Torque
Converter Clutch" 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 opera-
tion.
The transmission will downshift from Overdrive to Drive
if the accelerator pedal is fully pressed at vehicle speeds
above approximately 35 to 40 mph (57 to 65 km/h) for
sixth to fifth and 22 to 25 mph (36 to 40 km/h) for fifth to
fourth.