2009 JEEP GRAND CHEROKEE differential

Quadra-Drive IISystem — If Equipped
The optional Quadra-Drive IISystem features three
torque transfer couplings. The couplings include ELSD
(Electronic Limited-Slip Differential) front and rear axles
and Quadra-Trac IItransfer case. The optional ELSD
axles are fully automatic and require no driver input to
operate. Under normal driving conditions, the units
function as standard axles, balancing torque evenly be-
tween 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
IItransfer 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 two-wheel drive vehicles any more than
low-slung sports cars are designed to perform satisfacto-
rily 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.
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5

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 andstability. 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 “Partial Off” or “Full Off” modes. Refer to “ESP
(Electronic Stability Program)” in this section for more
information.
BAS (Brake Assist System)
The BAS is designed to optimize the vehicle’s braking
capability during emergency braking maneuvers. The
system detects an emergency braking situation by sens-
ing the rate and amount of brake application and then
applies optimum pressure to the brakes. This can help
reduce braking distances. The BAS complements the
anti-lock brake system (ABS). Applying the brakes very
quickly results in the best BAS assistance. To receive the
STARTING AND OPERATING 313
5

Chassis
Component Fluid, Lubricant, or Genuine Part
Automatic Transmission MOPARATF+4 Automatic Transmission Fluid
Transfer Case (NV140 Single Speed
Only)MOPARATF+4 Automatic Transmission Fluid
Transfer Case (NV245 Two Speed
Only)MOPARNV 247/245 Transfer Case Lubricant
Axle Differential (Front-Rear) MOPARSynthetic Gear & Axle Lubricant SAE 75W-140 (API-GL5) or
equivalent with friction modifier additive.
Brake Master Cylinder MOPARDOT 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 rec-
ommended brake fluids.
Power Steering Reservoir This system requires the use of MOPARHydraulic System Power Steer-
ing Fluid (P/N 05142893AA) or equivalent, which meets Chrysler Material
Standard MS-10838.
460 MAINTAINING YOUR VEHICLE

Fog Lights.......................135,192,453
Folding Rear Seat........................ 122
Four Wheel Drive....................... 296
Operation........................... 296
Systems............................. 296
Four Wheel Drive Operation................ 296
Four-Way Hazard Flasher.................. 390
Freeing A Stuck Vehicle................... 295
Front Axle (Differential)................... 431
Front Heated Seats....................... 118
Fuel................................. 355
Diesel.............................. 360
Filler Cap (Gas Cap).................... 364
Gasoline............................ 355
Gauge.............................. 192
Materials Added....................... 358
Octane Rating......................355,356
Requirements......................... 456
Tank Capacity........................ 456Fuel, Flexible.............See Flexible Fuel Vehicles
Fuel System Caution................358,365,367
Fuses................................ 441
Garage Door Opener (HomeLink) ........... 154
Gas Cap (Fuel Filler Cap)............364,366,410
Gasoline (Fuel)......................... 355
Gasoline, Reformulated................... 356
Gasoline/Oxygenate Blends................ 356
Gauges
Coolant Temperature................... 189
Fuel............................... 192
Speedometer......................... 184
Tachometer.......................... 187
Gear Ranges........................... 288
General Information...............20,26,110,355
Glass Cleaning.......................... 440
Glow Plug Light........................ 193
Gross Axle Weight Rating...............367,370
504 INDEX

Park Sense System, Rear................... 147
Parking Brake.......................... 308
Passing Light........................... 137
Pedals, Adjustable....................... 143
Personal Settings........................ 202
Pets.................................. 68
Pets, Transporting........................ 68
Phone, Cellular.......................... 82
Phone, Hands-Free (uconnect)............... 82
Placard, Tire and Loading Information......... 331
Polishing and Waxing..................... 437
Power
Distribution Center (Fuses)............... 444
Door Locks........................... 29
Inverter............................. 165
Mirrors.............................. 80
Outlet (Auxiliary Electrical Outlet).......... 163
Seats............................... 117
Steering..........................306,307Sunroof............................. 160
Windows............................. 31
Pregnant Women and Seat Belts.............. 45
Preparation for Jacking.................... 393
Pretensioners
Seat Belts............................ 43
Programmable Electronic Features............ 202
Programming Transmitters
(Remote Keyless Entry).................... 21
Quadra-Trac.........................296,297
Radial Ply Tires......................... 338
Radio Operation........................ 260
Radio, Satellite (uconnect gps)............252,257
Rain Sensitive Wiper System................ 141
Rear Axle (Differential).................... 431
Rear Camera........................... 151
Rear Cupholder......................... 167
510 INDEX