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158 STARTING AND OPERATING
This transfer case is designed to be driven in
the two-wheel drive position (2WD) or
four-wheel drive position (4WD AUTO) for
normal street and highway conditions on dry
hard surfaced roads. Driving the vehicle in 2WD
will have greater fuel economy benefits as the
front axle is not engaged in 2WD.
For variable driving conditions, the 4WD AUTO
mode can be used. In this mode, the front axle
is engaged, but the vehicle's power is sent to
the rear wheels. Four-wheel drive will be
automatically engaged when the vehicle senses
a loss of traction. Because the front axle is
engaged, this mode will result in lower fuel
economy than the 2WD mode.
In the event that additional traction is required,
the transfer case 4WD High and 4WD Low
positions can be used to lock the front and rear
driveshafts together, forcing the front and rear
wheels to rotate at the same speed. The 4WD
High and 4WD Low positions are intended for
loose, slippery road surfaces only and not
intended for normal driving. Driving in the 4WD
High and 4WD Low positions on hard-surfaced
roads will cause increased tire wear and damage
to the driveline components. Refer to “Shifting
Procedures” in this section for further information
on shifting into 4WD High or 4WD Low.
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 4WD High position.
When operating your vehicle in 4WD Low, the
engine speed will be approximately three times
(four times for Rubicon models) that of the 2WD
High or 4WD High 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
2WD High To 4WD High AUTO Or 4WD High
AUTO To 2WD High
Shifting between 2WD High and 4WD High
AUTO 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.
2WD High/4WD High AUTO To 4WD High PT Or
4WD High PT To 2WD High/4WD High AUTO
Shifting between 2WD High/4WD High AUTO to
4WD High PT 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.
21_JL_OM_EN_USC_t.book Page 158
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