FOUR–WHEEL DRIVE OPERATION
(COMMAND-TRAC I OR ROCK-TRAC)
The transfer case provides four mode positions:
• 2H (Two-wheel drive high range)
• 4H (Four-wheel drive high range)
• N (Neutral)
In the event that additional traction is required, the transfer case 4H and 4L positions can be used to lock the front and rear driveshafts together, forcing the front and rear wheels to rotate at the same speed. This is accomplished by simply moving the shift lever to one of these positions.
The 4H and 4L positions are intended for loose, slippery road surfaces only and not intended for normal driving. Driving in the 4H and 4L positions on hard surfaced roads will cause increased tire wear and damage to the driveline components.
The “4WD Indicator Light” (located in the instrument cluster) alerts the driver that the vehicle is in four-wheel drive, and the front and rear driveshafts are locked together. The light will illuminate when the transfer case is shifted into the 4H position.
NOTE: Do not attempt to shift when only the front or rear wheels are spinning. The transfer case is not equipped with a synchronizer, and the front and rear driveshaft speeds must be equal for a shift to take place. Shifting while only the front or rear wheels are spinning can cause damage to the transfer case.
When operating your vehicle in 4L, the engine speed will be approximately three times (four times for Rubicon models) that of the 2H or 4H positions at a given road speed. Take care not to overspeed the engine.
Proper operation of four-wheel drive vehicles depends on tires of equal size, type, and circumference on each wheel. Any difference will adversely affect shifting and
cause damage to the transfer case. In other words there needs to be 4 tires of identical size, and with similar wear.
Because four-wheel drive provides improved traction, there is a tendency to exceed safe turning and stopping speeds. Do not go faster than road conditions permit.
You or others could be injured if you leave the vehicle unattended with the transfer case in the N (Neutral) position without first fully engaging the parking brake. The transfer case N (Neutral) position disengages both the front and rear driveshaft from the powertrain, and will allow the vehicle to move regardless of the transmission position. The parking brake should always be applied when the driver is not in the vehicle.
For additional information on the appropriate use of each transfer case mode position, see the information below:
This range is used for normal street and highway driving on hard-surfaced roads.
This range locks the front and rear driveshafts together, forcing the front and rear wheels to rotate at the same speed. This range (4H) provides additional traction for
loose, slippery road surfaces and should not be used on dry pavement. The “4WD Indicator Light” (located in the instrument cluster) will illuminate when the transfer case is shifted into the 4H position.
N (Neutral) Position
This range disengages the front and rear driveshafts from the powertrain. It is to be used for flat towing behind another vehicle. Refer to “Recreational Towing” in “Starting and Operating” section of your owners manual for further information.
This range locks the front and rear driveshafts together, forcing the front and rear wheels to rotate at the same speed. This range (4L) provides additional traction and
maximum pulling power for loose, slippery road surfaces only. Do not exceed 25 mph (40 km/h). The “4WD Indicator Light” (located in the instrument cluster) will illuminate when the transfer case is shifted into the 4L position.
NOTE: When in 4WD, the “ESC Off Indicator Light”
will display in the instrument cluster.
2H to 4H or 4H to 2H
Shifting between 2H and 4H can be made with the vehicle stopped or in motion. With the vehicle in motion, the transfer case will engage/disengage faster if you momentarily release the accelerator pedal after completing the shift. Apply a constant force when shifting the transfer case lever.
4H to 4L or 4L to 4H
With the vehicle rolling at 2 to 3 mph (3 to 5 km/h), shift an automatic transmission into NEUTRAL (N), or press the clutch pedal on a manual transmission. While the vehicle is coasting at 2 to 3 mph (3 to 5 km/h), shift the transfer case lever firmly to the desired position. Do not pause with the transfer case in N (Neutral). Once the shift
is completed, place the automatic transmission into DRIVE or release the clutch pedal on a manual transmission.
NOTE: Shifting into or out of 4L is possible with the vehicle completely stopped; however, difficulty may occur due to the mating teeth not being properly aligned.
Several attempts may be required for clutch teeth alignment and shift completion to occur. The preferred method is with the vehicle rolling at 2 to 3 mph (3 to 5 km/h). Avoid attempting to engage or disengage 4L with the vehicle moving faster than 2 to 3 mph (3 to 5 km/h).
Failure to engage a position completely can cause transfer case damage or loss of power and vehicle control. You could have a collision. Do not drive the vehicle unless the transfer case is fully engaged.
AXLE LOCK (TRU–LOK) "LOCKERS" — RUBICON MODELS
The AXLE LOCK switch is located on the instrument panel (to the left of the steering column on newer models).
This feature will only activate when the following conditions are met:
• Key in ignition, vehicle in 4L (Low) range.
• Vehicle speed should be 10 mph (16 km/h) or less.
To activate the system, press the bottom of the AXLE LOCK switch once to lock the rear axle only (the “Rear Axle Lock Indicator Light” will illuminate), press the bottom of the switch again to lock the front axle (the “Front Axle Lock Indicator Light” will illuminate).
When the rear axle is locked, pressing the switch again will lock or unlock the front axle.
NOTE: The indicator lights will flash until the axles are fully locked or unlocked.
To unlock the axles, press the top of the AXLE LOCK switch. Axle lock will disengage if the vehicle is taken out of 4L (Low) range, or the ignition switch is turned to the OFF
ELECTRONIC SWAY BAR DISCONNECT — IF EQUIPPED
Your vehicle may be equipped with an electronic disconnecting stabilizer/sway bar. This system allows greater front suspension travel (articulation) in off-road situations.
This system is controlled by the SWAY BAR switch located on the instrument panel (to the left of the steering column on newer models).
Press the SWAY BAR switch to activate the system. Press the switch again to deactivate the system. The “Sway Bar Indicator Light” (located in the instrument cluster) will
illuminate when the bar is disconnected. The “Sway Bar Indicator Light” will flash during activation transition, or when activation conditions are not met. The stabilizer/
sway bar should remain in on-road mode during normal driving conditions.
To disconnect the stabilizer/sway bar, shift to either 4H or 4L and press the SWAY BAR switch to obtain the off-road position. Refer to “Four-Wheel Drive Operation” in Starting and Operating” of your owner's manual for further information.
The “Sway Bar Indicator Light” will flash until the stabilizer/ sway bar has been fully disconnected.
NOTE: The stabilizer/sway bar may be torque locked due to left and right suspension height differences. This condition is due to driving surface differences or vehicle
loading. In order for the stabilizer/sway bar to disconnect/reconnect, the right and left halves of the bar must be aligned/ on level ground.
This alignment may require that the vehicle be driven onto level ground or rocked from side to side. To return to on-road mode, press the SWAY BAR switch again.
Do not disconnect the stabilizer bar and drive on hard-surfaced roads or at speeds above 18 mph (29 km/h); you may lose control of the vehicle, which could result in serious injury. The front stabilizer bar enhances vehicle stability and is necessary for maintaining control of the vehicle. The system monitors vehicle speed and will attempt to reconnect the stabilizer bar at speeds over 18 mph (29 km/h). This is indicated by a flashing or solid “Sway Bar Indicator Light.” Once vehicle speed is reduced below 14 mph
(22 km/h), the system will once again attempt to return to off-road mode.
HILL DESCENT CONTROL (HDC) - IF EQUIPPED
HDC is only intended for low speed off-road driving.
HDC maintains vehicle speed while descending hills in off-road driving conditions by applying the brakes when necessary. There is a symbol on your dash that indicates the status of the Hill Descent Control (HDC) feature. The lamp will be on solid when HDC is armed. HDC can only be armed when the transfer case is in the “4WD LOW” position and the vehicle speed is less then 30 mph (48 km/h). If these conditions are not met while attempting to use the HDC feature, the HDC indicator light will flash on/off.
When enabled, HDC senses the terrain and activates when the vehicle is descending a hill. HDC speed may be adjusted by the driver to suit the driving conditions. The speed corresponds to the transmission gear selected.
Gear Approximate HDC Set Speed
1st 1 mph (1.5 km/h)
2nd 2.5 mph (4 km/h)
3rd 4 mph (6.5 km/h)
4th 5.5 mph (9 km/h)
DRIVE 7.5 mph (12 km/h)
REVERSE 1 mph (1.5 km/h)
However, the driver can override HDC operation by applying the brake to slow the vehicle down below the HDC control speed. If more speed is desired during HDC control, the Accelerator pedal will increase vehicle speed in the usual manner. When either the brake or the accelerator is released,
1. Shift the transfer case into 4WD LOW range. Refer to “Four-Wheel Drive Operation” in “Starting and Operating” for further information.
2. Press the “Hill Descent” button. The “Hill Descent Control Indicator Light” in the instrument cluster will turn on solid.
NOTE: If the transfer case is not in 4WD LOW range, the “Hill Descent Control Indicator Light” will flash for five seconds and HDC will not be enabled.
1. Press the “Hill Descent” button or shift the transfer case out of 4WD LOW range. The “Hill Descent Control Indicator” light in the instrument cluster will turn off.