Chrysler 2008 Aspen - Manual (Page 279)

The transmission will downshift from OVERDRIVE to
DRIVE if the accelerator pedal is fully depressed at
vehicle speeds above approximately 35 mph (56 km/h).
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 button. This will improve
performance and reduce the potential for transmission
overheating or failure due to excessive shifting. When
operating in TOW/HAUL mode, 5th gear (if equipped) is
disabled and 2-3 and 3-4 shift patterns are modified.
Shifts into OVERDRIVE (4th gear) are allowed during
steady cruise (for improved fuel economy) and automatic
closed-throttle downshifts to 3rd gear (for improved
braking) will occur during steady braking.
The TOW/HAUL light will illuminate in the instrument
cluster to indicate when the switch has been activated.
Pressing the switch a second time restores normal opera-
tion. If the TOW/HAUL mode is desired, the button
must be pressed each time the engine is started.
TOW/HAUL Button
278 STARTING AND OPERATING