Rocking The Vehicle; Four-Wheel Drive Operation - Jeep Grand Cherokee Owner's Manual

NOTE:
• The torque converter clutch will not en-
gage until the transmission fluid and en-
gine coolant are warm [usually after 1 to
3 miles (1.6 to 4.8 km) of driving]. Because
the engine speed is higher when the
torque converter clutch is not engaged, it
may seem as if the transmission is not
shifting into Overdrive when cold. This is
normal. Manually shifting (using the ERS
shift control) between 4 (direct gear) and
5/D (Overdrive gear) positions will dem-
onstrate that the transmission is able to
shift into and out of Overdrive. For ve-
hicles with 5.7L engine (which have two
Overdrive gears), the transmission may
not shift into the top Overdrive gear (nor-
mal 5th gear) until the transmission fluid
and engine coolant are warm.
• If the vehicle has not been driven in sev-
eral days, the first few seconds of opera-
tion after shifting the transmission into
gear may seem sluggish. This is due to
the fluid partially draining from the torque
converter into the transmission. This con-
dition is normal and will not cause dam-
age to the transmission. The torque con-
verter will refill within five seconds of
shifting from PARK into any other gear
position.

Rocking the Vehicle

If the vehicle becomes stuck in snow, sand, or
mud, it can often be moved by a rocking
motion. Move the shift lever between DRIVE
and REVERSE, while applying slight pressure
to the accelerator.
NOTE:
The Electronic Stability Program (ESP) and
Traction Control System (TCS) (if equipped)
should be turned OFF before attempting to
rock the vehicle. Refer to "Electronic Brake
Control System" in Section 3 of this manual.
The least amount of accelerator pedal pressure
to maintain the rocking motion, without spinning
the wheels or racing the engine, is most effec-
tive. Racing the engine or spinning the wheels,
due to the frustration of not freeing the vehicle,
may lead to transmission overheating and fail-
ure. Allow the engine to idle with the shift lever
in NEUTRAL for at least one minute after every
five rocking-motion cycles. This will minimize
overheating and reduce the risk of transmission
failure during prolonged efforts to free a stuck
vehicle.
CAUTION!
When "rocking" a stuck vehicle by moving
between "First" and REVERSE, do not spin
the wheels faster than 15 mph (24 km/h) or
drivetrain damage may result.

FOUR-WHEEL DRIVE OPERATION

Quadra-Trac II Operating
Instructions/Precautions — If
Equipped
The Quadra-Trac II transfer case provides
three mode positions:
• 4WD HI
• NEUTRAL (N)
• 4WD LOW
The Quadra-Trac II transfer case is fully auto-
matic in the normal driving 4WD HI mode.
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