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•
Shifting into or out of 4WD LOW is possible with the
vehicle completely stopped; however, difficulty may
occur due to the mating clutch teeth not being prop-
erly aligned. Several attempts may be required for
clutch teeth alignment and shift completion to
occur. The preferred method is with the vehicle roll-
ing 0 to 3 mph (0 to 5 km/h). If the vehicle is mov-
ing faster than 3 mph (5 km/h), the transfer case
will not allow the shift.
QUADRA-DRIVE II SYSTEM —
IF EQUIPPED
The Quadra-Drive II System features two torque transfer
couplings. The couplings include an Electronic Limited-
Slip Differential (ELSD) rear axle and the Quadra-Trac II
transfer case. The ELSD axle is fully automatic and
requires no driver input to operate. Under normal driv-
ing conditions, the unit functions as a standard axle,
balancing torque evenly between left and right wheels.
With a traction difference between left and right
wheels, the coupling will sense a speed difference. As
one wheel begins to spin faster than the other, torque
will automatically transfer from the wheel that has less
traction, to the wheel that has traction. While the trans-
fer case and axle coupling differ in design, their opera-
tion is similar. Follow the Quadra-Trac II transfer case
shifting information, preceding this section, for shifting
this system.
SELEC-TERRAIN — IF EQUIPPED
SELEC-TERRAIN MODE SELECTION
Selec-Terrain combines the capabilities of the vehicle
control systems, along with driver input, to provide the
best performance for all terrains. Tap the toggle up or
down to cycle through the positions.
Selec-Terrain consists of the following positions:
•
ROCK (if equipped) – Off-road calibration is only
available in 4WD LOW. The vehicle is raised
(if equipped with Air Suspension) for improved
ground clearance. Traction-based tuning with
improved steerability for use on high traction off-
road surfaces. Use for low speed obstacles such as
large rocks, deep ruts, etc. If equipped with air sus-
pension, the vehicle level will change to Off-Road 2
(OR2). If the Selec-Terrain switch is in ROCK mode,
and the transfer case is switched from 4WD LOW to
4WD HI, the Selec-Terrain system will return to
AUTO.
•
SAND/MUD (if equipped) – Off-road calibration for
use on low traction surfaces such as mud or sand.
Driveline is maximized for traction. Some binding
may be felt on less forgiving surfaces. The electronic
brake controls are set to limit traction control man-
agement of throttle and wheel spin. If equipped with
air suspension, the level will change to Off-Road 1
(OR1).
•
SNOW – Tuning set for additional stability in inclem-
ent weather. Use on and off road on loose traction
surfaces such as snow. When in SNOW mode
(depending on certain operating conditions), the
transmission may use SECOND gear (rather than
FIRST gear) during launches, to minimize wheel slip-
page. If equipped with air suspension, the default
ride height for SNOW is Normal Ride Height (NRH).
•
AUTO – Fully automatic full-time four-wheel drive
operation can be used on and off road. Balances
traction with seamless steering feel to provide
improved handling and acceleration over two-wheel
drive vehicles. If equipped with air suspension, the
level will change to Normal Ride Height (NRH).
•
SPORT – This mode alters the transmission's auto-
matic shift schedule for sportier driving. Upshift
speeds are increased to make full use of available
engine power. Steering efforts are modified for
sporty driving. If equipped with air suspension, the
level will change to Aero Height.
Selec-Terrain
1 — Selec-Terrain Positions
2 — Selec-Terrain Toggle
124 STARTING AND OPERATING
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