Dodge 2009 Ram Truck Owner's Manual page 320

318 STARTING AND OPERATING
When To Use TOW/HAUL Mode
When driving in hilly areas, towing a trailer, carrying a
heavy load, etc., and frequent transmission shifting oc-
curs, press the TOW/HAUL switch. This will improve
performance and reduce the potential for transmission
overheating or failure due to excessive shifting. When
operating in TOW/HAUL mode, the transmission will
shift to third gear and fourth gear will be enabled under
steady cruise conditions.
TOW/HAUL Switch
The "TOW/HAUL Indicator Light" will illuminate in the
instrument cluster to indicate when the switch has been
activated. Pressing the switch a second time restores
normal operation. If the TOW/HAUL mode is desired,
the switch must be pressed each time the engine is
started.