Jeep Wrangler2018 Owner's Manual page 319

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.
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.
WARNING!
You or others could be injured or killed if you leave the
vehicle unattended with the transfer case in the NEU-
TRAL (N) position without first fully engaging the
parking brake. The transfer case NEUTRAL (N) posi-
tion disengages both the front and rear driveshafts
from the powertrain, and will allow the vehicle to roll,
even if the automatic transmission is in PARK (or
manual transmission is in gear). The parking brake
should always be applied when the driver is not in the
vehicle.
Shifting Procedures
2H To 4H Or 4H To 2H
Shifting between 2H and 4H can be made with the vehicle
stopped or in motion. The preferred shifting speed would
be 0 to 45 mph (72 km/h). With the vehicle in motion, the
transfer case will engage/disengage faster if you momen-
tarily release the accelerator pedal after completing the
shift. Do not accelerate while shifting the transfer case.
Apply a constant force when shifting the transfer case
lever.
NOTE:
• Do not attempt to make a shift while only the front or
rear wheels are spinning. The front and rear driveshaft
speeds must be equal for the shift to take place. Shifting
while only the front or rear wheels are spinning can
cause damage to the transfer case.
• Delayed shifts out of four-wheel drive may be experi-
enced due to uneven tire wear, low or uneven tire
pressures, excessive vehicle loading, or cold tempera-
tures.
• Shifting effort will increase with speed, this is normal.
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