Range Selection

Range Selection
The transmission has 7 range positions: P, R, N, (D), 3, 2 and 1.





Park
In the PARK position:
^ there is no powerflow through the transmission.
^ the parking pawl locks the output shaft to the case.
^ the engine can be started.
^ the ignition key can be removed.

Reverse
In the REVERSE position:
^ the vehicle can be operated in a rearward direction, at a reduced gear ratio.

Neutral
In the NEUTRAL position:
^ there is no powerflow through the transmission.
^ the output shaft is not held and is free to turn.
^ the engine can be started.

Overdrive
Overdrive is the normal position for most forward driving.

The OVERDRIVE position provides:
^ automatic shifts 1st through 6th gears.
^ apply and release of the torque converter clutch.
^ maximum fuel economy during normal operation.

Overdrive OFF (Cancelled) (Not shown on display) (6.0L engine)
Overdrive OFF mode is activated by pressing the transmission control (TC) switch at the end of the selector lever while the vehicle is in the (D) position.

The OVERDRIVE cancelled mode provides:
^ automatic shifts 1st through 5th gears.
^ traction and engine braking.
^ additional power while towing or hauling heavy loads.

Tow/Haul (6.8L and 5.4L engines)
The tow/haul feature was designed to assist the driver when towing a trailer or a heavy load. All transmission gear ranges, including all 5 forward gears, are available when using the tow/haul feature.

The tow/haul function is activated and deactivated through a switch located on the end of the selector lever. The indicator light that is located at the end of the selector lever will illuminate when the tow/haul feature is activated and will go off when deactivated. On some models, the indicator light is located on the instrument panel.

With tow/haul activated, the transmission will have these features:
^ Shifts will occur at higher vehicle speeds for a given accelerator pedal position to improve vehicle acceleration, reduce excessive shifting and increase the coast braking capability.
^ The torque converter will lock up at lower vehicle speeds than normal with a given accelerator pedal position to improve transmission cooling and efficiency.
^ Upshifts are temporarily delayed while decreasing accelerator position during hill cresting to reduce excessive transmission shifting and to prepare for a possible grade braking downshift event.
^ Engine braking is provided in all forward gears without the requirement of moving the selector lever.
^ Manual 1, 2 or 3 will still be available.
^ Grade braking downshift feature provides increased coast braking automatically to assist the driver in maintaining the desired speed while descending a grade.

This reduces duty cycle on the brake system and increases brake pad longevity.
^ Grade braking downshifts are automatically commanded when:
- positive vehicle acceleration is sensed (natural acceleration from grade descent).
- a near zero accelerator pedal position is obtained.
- a minimum amount of time has expired since the last grade braking downshift.
^ Grade braking downshift mode is immediately exited should the tow/haul mode be deactivated or if the accelerator pedal is depressed beyond a minimum threshold.

Third Position - 3rd Gear
This position provides:
^ third gear start and hold.
^ improved traction and engine braking on slippery roads.

Second Position - 2nd Gear
If this position is selected at higher speeds, the transmission will downshift into a lower gear, and will downshift into 2nd gear after the vehicle decelerates to the correct speed.

The transmission will not downshift if it will cause an engine over speed condition.

This position provides:
^ second gear start and hold.
^ improved traction and engine braking on slippery roads.

First Position - Manual Low Gear
If this position is selected at higher speeds, the transmission will downshift into a lower gear, and will downshift into 1st gear after the vehicle decelerates to the correct speed.

The transmission will not downshift if it will cause an engine over-speed condition.

This position provides:
^ first gear operation only.
^ engine braking for descending steep grades.