differential JEEP GRAND CHEROKEE 2008 WK / 3.G Owners Manual

WARNING!
ABS (Anti-Lock Brake System) cannot prevent the
natural laws of physics from acting on the vehicle,
nor can it increase the traction afforded by prevailing
road conditions. ABS cannot prevent accidents, in-
cluding those resulting from excessive speed in
turns, driving on very slippery surfaces, or hydro-
planing. Only a safe, attentive, and skillful driver can
prevent accidents. The capabilities of an ABS-
equipped vehicle must never be exploited in a reck-
less or dangerous manner which could jeopardize the
user's safety or the safety of others.
TCS (Traction Control System)
This system monitors the amount of wheel spin of each of
the driven wheels. If wheel spin is detected, brake
pressure is applied to the slipping wheel(s) and engine
power is reduced to provide enhanced acceleration and
stability. A feature of the TCS system functions similar to
a limited slip differential and controls the wheel spin
across a driven axle. If one wheel on a driven axle is
spinning faster than the other, the system will apply the
brake of the spinning wheel. This will allow more engine
torque to be applied to the wheel that is not spinning.
This feature remains active even if TCS and ESP are in
either the ªPartial Offº or ªFull Offº modes. Refer to ªESP
(Electronic Stability Program)º in this section for more
information.
UNDERSTANDING THE FEATURES OF YOUR VEHICLE 139
3

Quadra-Drive IITSystem Ð If Equipped
The optional Quadra-Drive IItSystem features three
torque transfer couplings. The couplings include ELSD
(Electronic Limited Slip Differential) front and rear axles
and Quadra-Trac IIttransfer case. The optional ELSD
axles are fully automatic and require no driver input to
operate. Under normal driving conditions the units func-
tion as standard axles 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 transfer case and axle couplings differ in design, their
operation is similar. Follow the Quadra-Trac IIttransfer
case shifting information, preceding this section, for
shifting this system.
ON-ROAD DRIVING TIPS
Utility vehicles have higher ground clearance and a
narrower track to make them capable of performing in a
wide variety of off-road applications. Specific design
characteristics give them a higher center of gravity than
ordinary cars.
An advantage of the higher ground clearance is a better
view of the road, allowing you to anticipate problems.
They are not designed for cornering at the same speeds as
conventional 2-wheel drive vehicles any more than low-
slung sports cars are designed to perform satisfactorily in
off-road conditions. If at all possible, avoid sharp turns or
abrupt maneuvers. As with other vehicles of this type,
failure to operate this vehicle correctly may result in loss
of control or vehicle rollover.
STARTING AND OPERATING 299
5

Component Fluid, Lubricant, or Genuine Part
Fuel Selection (5.7L Engines) 87 Octane Acceptable - 89 Octane Recommended
Fuel Selection (3.0L Diesel Engines) Use only the best quality fuel with a calculated Cetane Index of 42±46.
In addition, the manufacturer recommends using diesel fuel with a
sulfur content ofless than or equal to 15 ppm.
Chassis
Component Fluid, Lubricant, or Genuine Part
Automatic Transmission MopartATF+4 Automatic Transmission Fluid
Transfer Case (NV140 Single Speed Only) MopartATF+4 Automatic Transmission Fluid
Transfer Case (NV245 Two Speed Only) MopartNV 247/245 Transfer Case Lubricant
Axle Differential (Front-Rear) MopartSynthetic Gear & Axle Lubricant SAE 75W-140 (API-GL5)
or equivalent with friction modifier additive.
Brake Master Cylinder MopartDOT 3 Brake Fluid, SAE J1703 should be used. If DOT 3,
SAE J1703 brake fluid is not available, then DOT 4 is acceptable.
Use only recommended brake fluids.
Power Steering Reservoir This system requires the use of MopartHydraulic System Power
Steering Fluid (P/N 05142893AA) or equivalent, which meets
DaimlerChrysler Material Standard MS-10838.
442 MAINTAINING YOUR VEHICLE

Fluids, Lubricants and Genuine Parts.......... 441
Fog Light Service........................ 437
Fog Lights.......................127,195,437
Folding Rear Seat........................ 115
Four Wheel Drive....................... 293
Operation........................... 293
Systems............................. 293
Four Wheel Drive Operation................ 293
Four-Way Hazard Flasher.................. 370
Freeing A Stuck Vehicle................... 292
Front Axle (Differential)................... 415
Front Heated Seats....................... 111
Fuel................................. 336
Diesel.............................. 344
Filler Cap (Gas Cap).................... 346
Gasoline............................ 336
Gauge.............................. 195
Hoses.............................. 412
Materials Added....................... 339Octane Rating......................336,337
Requirements......................... 440
System Hoses......................... 412
Tank Capacity........................ 440
Fuel, Flexible.............See Flexible Fuel Vehicles
Fuel System Caution................339,346,348
Fuses................................ 426
Garage Door Opener (HomeLinkt) ........... 158
Gas Cap (Fuel Filler Cap)............346,348,391
Gasoline (Fuel)......................... 336
Gasoline, Reformulated................... 337
Gasoline/Oxygenate Blends................ 338
Gauges
Coolant Temperature.................... 192
Fuel................................ 195
Speedometer......................... 188
Tachometer.......................... 190
Gear Ranges........................... 286
476 INDEX

Seats............................ 110,111
Steering..........................308,403
Sunroof............................. 165
Windows............................. 31
Pregnant Women and Seat Belts.............. 45
Preparation for Jacking.................... 374
Pretensioners
Seat Belts............................. 43
Programmable Electronic Features............ 206
Programming Transmitters (Remote Keyless
Entry)................................. 21
Quadra-Trac........................... 293
Radial Ply Tires......................... 321
Radio Broadcast Signals................... 212
Radio, Navigation....................... 244
Radio Operation......................241,258
Radio, Satellite....................241,244,250Radio (Sound Systems).................... 241
Rain Sensitive Wiper System................ 131
Rear Axle (Differential).................... 415
Rear Camera........................... 156
Rear Cup Holder........................ 171
Rear Heated Seats....................... 113
Rear Park Sense System................... 152
Rear Seat, Folding....................... 115
Rear Window Defroster................... 178
Rear Window Features.................... 177
Rear Wiper/Washer...................... 177
Rearview Mirrors........................ 77
Reclining Front Seats..................... 108
Recorder, Event Data...................... 56
Recreational Towing...................... 364
Shifting into Transfer Case Neutral (N)....... 365
Shifting out of Transfer Case Neutral (N)..... 367
Reformulated Gasoline.................... 337
Refrigerant............................ 403
INDEX 483
10