Jeep WRANGLER 2020 Owner's Manual page 230

228 STARTING AND OPERATING
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.
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.
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 momentarily
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

experienced due to uneven tire wear, low or
uneven tire pressures, excessive vehicle
loading, or cold temperatures.
Shifting effort will increase with speed, this is

normal.
During cold weather, you may experience
increased effort in shifting until the transfer
case fluid warms up. This is normal.
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).
WARNING!
Failure to engage a transfer case 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.