2009 JEEP WRANGLER differential

4H to 4L or 4L to 4H
With the vehicle rolling at 2 to 3 mph (3 to 5 km/h), shift
an automatic transmission into NEUTRAL (N), or press
the clutch pedal on a manual transmission. While the
vehicle is coasting at 2 to 3 mph (3 to 5 km/h), shift the
transfer case lever firmly to the desired position. Do not
pause with the transfer case in N (Neutral).
NOTE:Shifting into or out of 4L is possible with the
vehicle completely stopped; however, difficulty may oc-
cur due to the mating teeth not being properly aligned.
Several attempts may be required for clutch teeth align-
ment and shift completion to occur. The preferred
method is with the vehicle rolling at 2 to 3 mph (3 to
5 km/h). Avoid attempting to engage or disengage 4L
with the vehicle moving faster than 2 to 3 mph (3 to
5 km/h).WARNING!
Failure to engage a position completely can cause
transfer case damage or loss of power and vehicle
control. You could have an injury accident. Do not
drive the vehicle unless the transfer case is fully
engaged.
TRAC-LOK REAR AXLE — IF EQUIPPED
The Trac-Lok rear axle provides a constant driving force
to both rear wheels and reduces wheel spin caused by the
loss of traction at one driving wheel. If traction differs
between the two rear wheels, the differential automati-
cally proportions the usable torque by providing more
torque to the wheel that has traction.
Trac-Lok is especially helpful during slippery driving
conditions. With both rear wheels on a slippery surface, a
slight application of the accelerator will supply maxi-
mum traction.5
STARTING AND OPERATING 295

designated and approved. You should tread lightly and
avoid damage to the environment. You should know
your vehicle’s abilities and be able to recover it if
something goes wrong. You should never stop or shut a
vehicle off when crossing deep water unless you ingested
water into the engine air intake. If the engine stalls, do
not attempt to restart it. Determine if it has ingested
water first. The key to any crossing is low and slow. Shift
into first gear (manual transmission), or DRIVE (auto-
matic transmission), with the transfer case in the 4L
(Low) position and proceed very slowly with a constant
slow speed {3 to 5 mph (5 to 8 km/h) maximum} and
light throttle. Keep the vehicle moving; do not try to
accelerate through the crossing. After crossing any water
higher than the bottom of the axle differentials, you
should inspect all of the vehicle fluids for signs of water
ingestion.CAUTION!
•Water ingestion into the axles, transmission, trans-
fer case, engine or vehicle interior can occur if you
drive too fast or through too deep of water. Water
can cause permanent damage to engine, driveline
or other vehicle components, and your brakes will
be less effective once wet and/or muddy.
•This vehicle is capable of crossing through water
at a depth of 30 inches (76 cm) at speeds no greater
than 5 mph (8 km/h). Water ingestion can occur
causing damage to your vehicle.
Before You Cross Any Type of Water
As you approach any type of water, you need to deter-
mine if you can cross it safely and responsibly. If neces-
sary, get out and walk through the water or probe it with
a stick. You need to be sure of its depth, approach angle,
current and bottom condition. Be careful of murky or
310 STARTING AND OPERATING

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.
Brake Assist System (BAS)
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 thebenefit of the system, you must apply continuous brak-
ing pressure during the stopping sequence. Do not
reduce brake pedal pressure unless braking is no longer
desired. Once the brake pedal is released, the BAS is
deactivated.
WARNING!
The Brake Assist System (BAS) cannot prevent the
natural laws of physics from acting on the vehicle,
nor can it increase the traction afforded by prevailing
road conditions. The BAS cannot prevent accidents,
including 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 a BAS-
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.
320 STARTING AND OPERATING

Chassis
ComponentFluid, Lubricant, or Genuine Part
Automatic Transmission MOPARATF+4 Automatic Transmission Fluid or equivalent.
Manual Transmission MOPARManual Transmission Lubricant or equivalent (meeting the re-
quirements of Chrysler Material Standard MS-9224).
Transfer Case MOPARATF+4 Automatic Transmission Fluid or equivalent.
Axle Differential (Front) MOPARGear & Axle Lubricant (SAE 80W-90) (API GL-5) or equivalent.
Axle Differential (Rear) 226 RBI (Model 44)- MOPARGear & Axle Lubricant (SAE 80W-90) (API
GL-5) or equivalent. For trailer towing, use MOPAR Synthetic Gear & Axle
Lubricant (SAE 75W-140) or equivalent. Models equipped with Trac-Lok™
require an 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 recom-
mended brake fluids.
Power Steering Reservoir MOPAR Power Steering Fluid +4, MOPARATF+4 Automatic Transmis-
sion Fluid or equivalent.
7
MAINTAINING YOUR VEHICLE 449

Fog Lights........................... 96,445
Fold and Tumble Rear Seat .................. 88
Folding Rear Seat ........................ 91
Folding Windshield ...................... 186
Four Wheel Drive ....................... 291
Shifting ............................. 293
Four Wheel Drive Operation ................ 291
Four-Way Hazard Flasher .................. 388
Front Axle (Differential) ................... 427
Fuel ................................. 356
Filler Cap (Gas Cap) .................... 361
Gasoline ............................ 356
Gauge .............................. 200
Materials Added ....................... 359
Octane Rating ........................ 356
Requirements ......................... 447
Tank Capacity ........................ 447
Fuel System Caution ................... 359,362
Fuses ................................ 436 Gas Cap (Fuel Filler Cap)
............361,363,402
Gasoline (Fuel) ......................... 356
Gasoline, Reformulated ................... 357
Gasoline/Oxygenate Blends ................ 357
Gauges Coolant Temperature ................... 204
Fuel ............................... 200
Odometer ........................... 207
Speedometer ......................... 200
Tachometer .......................... 204
Gear Ranges ........................ 282,288
General Information .................... 17,356
Glass Cleaning .......................... 432
Gross Axle Weight Rating ...............364,366
Gross Vehicle Weight Rating .............363,366
GVWR ............................... 363
Hands-Free Phone (uconnect) ............... 82
HardTop ............................. 115
10
INDEX 487

Oil Pressure Light....................... 201
Onboard Diagnostic System ..............402,403
Operator Manual (Owner’s Manual) ............ 6
Outside Rearview Mirrors .................. 82
Overheating, Engine ................... 205,388
Owner’s Manual (Operator Manual) .........6,477
Paint Care ............................. 428
Paint Damage .......................... 428
Panic Alarm ............................ 21
Parking Brake .......................... 315
Passing Light ........................... 96
Pets .................................. 73
Phone, Cellular .......................... 82
Phone, Hands-Free (uconnect) ............... 82
Placard, Tire and Loading Information ......... 339
Polishing and Waxing ..................... 429
Power Door Locks ........................... 32 Steering
.......................... 313,314
Windows ............................. 35
Pregnant Women and Seat Belts .............. 48
Preparation for Jacking .................... 390
Pretensioners Seat Belts ............................ 46
Radial Ply Tires ......................... 346
Radio Operation ........................ 263
Radio, Satellite (uconnect studios)........... 258
Rear Axle (Differential) .................... 427
Rear Swing Gate ......................... 37
Rear Window Defroster ................... 193
Rear Window Features .................... 192
Rear Wiper/Washer ...................... 192
Rearview Mirrors ........................ 81
Recorder, Event Data ...................... 59
Recreational Towing ...................... 382
Shifting into Transfer Case Neutral (N) ....... 383
492 INDEX