Four-Wheel Drive (If Equipped) - Four-Wheel Drive Limitations

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Four-Wheel Drive Limitations

Operating Four-Wheel Drive with a Spare or Mismatched Tires (If Equipped)

On four-wheel drive vehicles, the size of the spare tire can affect the four-wheel drive system. If there is a significant difference between the size of the spare tire and the remaining tires, you could have limited four-wheel drive functionality. When driving with the full-size dissimilar spare wheel and tire assembly, we recommend that you do not:

Exceed 50 mph (80 km/h) with a four-wheel drive mode turned on.
Turn on a four-wheel drive mode unless the vehicle is stationary.
Use a four-wheel drive mode on dry pavement.

Driving with the full-size dissimilar spare wheel and tire assembly can limit four-wheel drive functionality, especially when driving in a mechanically locked four-wheel drive mode. You can experience the following:

Additional noise from the transfer case or other drive components.
Difficulty shifting out of a mechanically locked four-wheel drive mode.

Use of a dissimilar spare wheel and tire assembly can lead to impairment of the following:

Comfort and noise.
Winter weather driving capability.
Wet driving capability.
Four-wheel drive capability.

Mechanical Shift Blocking

On four-wheel drive vehicles with a mechanically locked four-wheel drive high mode, the transfer case distributes torque to the front wheels by mechanically interlocking the front and rear driveshafts together. Various external factors can affect shifting performance of this type of system including, but not limited to:

Vehicle acceleration.
Dissimilar tire sizes.
Steering input.

If the system detects a mechanical shift blockage at speed after you select two-wheel drive high, the message "4x4 Unable to Disengage See Manual", could display momentarily. If this message displays, one or more of the following actions can relieve the mechanical shift block:

Momentary acceleration.
Momentary braking.
Bringing the vehicle to a stop.
Shifting the transmission to neutral and back to drive.
Shifting the transmission to reverse and back to drive.
Driving the vehicle around a tight turn at a slow speed.

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