Page 427 of 536
WHAT TO DO IN EMERGENCIESCONTENTS HAZARD WARNING FLASHERS ........... .426
IF YOUR ENGINE OVERHEATS ............ .426
WHEEL AND TIRE TORQUE SPECIFICATIONS . .427
▫ Torque Specifications ................... .427
JACKING AND TIRE CHANGING .......... .429
▫ 4500/5500 Models ..................... .430
▫ Preparations For Jacking ................. .430
▫ Jacking Instructions .................... .430
HOISTING ........................... .435
JUMP-STARTING PROCEDURES ........... .436
▫ Preparations For Jump-Start .............. .436 ▫ Jump-Starting Procedure ................. .437
FREEING A STUCK VEHICLE ............. .439
EMERGENCY TOW HOOKS — IF EQUIPPED . . .440
GEAR SELECTOR OVERRIDE ............. .441
TOWING A DISABLED VEHICLE ........... .442
▫ Two-Wheel Drive Models ................ .443
▫ Four-Wheel Drive Models ................ .444
ENHANCED ACCIDENT RESPONSE SYSTEM
(EARS) .............................. .444
EVENT DATA RECORDER (EDR) ........... .4446
Page 431 of 536

1 — 10 Bolt Pattern
2 — 8 Bolt Pattern
WARNING!To avoid the risk of forcing the vehicle off the jack, do
not tighten the lug nuts fully until the vehicle has been
lowered. Failure to follow this warning may result in
personal injury. JACKING AND TIRE CHANGING
WARNING!• Do not attempt to change a tire on the side of the
vehicle close to moving traffic, pull far enough off
the road to avoid the danger of being hit when
operating the jack or changing the wheel.
• Being under a jacked-up vehicle is dangerous. The
vehicle could slip off the jack and fall on you. You
could be crushed. Never put any part of your body
under a vehicle that is on a jack.
• Never start or run the engine while the vehicle is on
a jack. If you need to get under a raised vehicle, take
it to a service center where it can be raised on a lift.
• The jack is designed to use as a tool for changing
tires only. The jack should not be used to lift the
vehicle for service purposes. The vehicle should be
jacked on a firm level surface only. Avoid ice or
slippery areas.8/10 Lug Nuts/Bolts Torque Patterns
6WHAT TO DO IN EMERGENCIES 429
Page 432 of 536

4500/5500 Models
These vehicles do not come equipped with a jack.
NOTE: Jacking and tire changing on 4500/5500 models
should be performed by an authorized dealer, or knowl-
edgeable service personnel with the appropriate heavy
duty equipment, like a tire service company.
Preparations For Jacking
1. Park the vehicle on a firm, level surface. Avoid ice or
slippery areas.
WARNING!Do not attempt to change a tire on the side of the
vehicle close to moving traffic, pull far enough off the
road to avoid the danger of being hit when operating
the jack or changing the wheel.
2. Turn on the Hazard Warning flasher.
3. Apply the parking brake.
4. Place the gear selector into PARK (automatic transmis-
sion) or REVERSE (manual transmission). On 4-Wheel
drive vehicles, shift the transfer case to the “4L” posi-
tion. 5. Turn OFF the ignition.
6. Block both the front and rear of the wheel diagonally
opposite of the jacking position. For ex-
ample, if changing the right front tire, block
the left rear wheel.
NOTE: Passengers should not remain in the vehicle when
the vehicle is being jacked.
Jacking Instructions
Instructions
WARNING!Carefully follow these tire changing warnings to help
prevent personal injury or damage to your vehicle:
• Always park on a firm, level surface as far from the
edge of the roadway as possible before raising the
vehicle.
• Turn on the Hazard Warning flasher.
• Block the wheel diagonally opposite the wheel to be
raised. (Continued)430 WHAT TO DO IN EMERGENCIES
Page 433 of 536

WARNING! (Continued)• Set the parking brake firmly and set an automatic
transmission in PARK; a manual transmission in
REVERSE.
• Never start or run the engine with the vehicle on a
jack.
• Do not let anyone sit in the vehicle when it is on a
jack.
• Do not get under the vehicle when it is on a jack. If
you need to get under a raised vehicle, take it to a
service center where it can be raised on a lift.
• Only use the jack in the positions indicated and for
lifting this vehicle during a tire change.
• If working on or near a roadway, be extremely
careful of motor traffic.
• To assure that spare tires, flat or inflated, are securely
stowed, spares must be stowed with the valve stem
facing the ground. CAUTION!Do not attempt to raise the vehicle by jacking on
locations other than those indicated in the Jacking
Instructions for this vehicle.
1. If equipped, remove the spare wheel, jack, and tools
from storage.
2. Using the wheel wrench, loosen, but do not remove, the
wheel nuts by turning them counterclockwise one turn
while the wheel is still on the ground. Jack Warning Label
6WHAT TO DO IN EMERGENCIES 431
Page 434 of 536

3. When changing the front wheel, assemble the jack drive
tube to the jack and connect the drive tube to the
extension tube. Place the jack under the axle as close to
the tire as possible with the drive tubes extending to the
front. Connect the jack tube extension and wheel
wrench.
When changing a rear wheel, assemble the jack drive tube
to the jack and connect the drive tube to the extension tube.
Securely place the jack under the sway bar bracket (unless
both tires are flat on one side, then place jack under shock
bracket) facing forward in vehicle. Connect the jack tube
extension and lug wrench. Before raising the wheel off the ground, make sure that
the jack will not damage surrounding truck parts and
adjust the jack position as required.
NOTE: If the jack will not lower by turning the dial
(thumbwheel) by hand, it may be necessary to use the jack
drive tube in order to lower the jack.
4. By rotating the wheel wrench clockwise, raise the ve-
hicle until the wheel just clears the surface.Front Jacking Locations Rear Jacking Location432 WHAT TO DO IN EMERGENCIES
Page 437 of 536

wheel. The tires of both dual wheels must be completely off
the ground when tightening to insure wheel centering and
maximum wheel clamping.
Dual wheel models require a special heavy-duty lug nut
tightening adapter (included with the vehicle) to correctly
tighten the lug nuts. Also, when it is necessary to remove
and install dual rear wheels, use a proper vehicle lifting
device.
NOTE: When installing a spare tire (if equipped) as part of
a dual rear wheel end combination, the tire diameter of the
two individual tires must be compared. If there is a
significant difference, the larger tire should be installed in
a front location. The correct direction of rotation for dual
tire installations must also be observed.
It is recommended that wheel stud nuts be kept torqued to
specifications at all times. Torque wheel stud nuts to
specifications at each lubrication interval.
Wheel Nuts
All wheel nuts should be tightened occasionally to elimi-
nate the possibility of wheel studs being sheared or the bolt
holes in the wheels becoming elongated. This is especially
important during the first few hundred miles/kilometers
of operation to allow the wheel nuts to become properly set. All wheel nuts should first be firmly seated against the
wheel. The wheel nuts should then be tightened to recom-
mended torque. Tighten the wheel nuts to final torque in
increments. Progress around the bolt circle, tightening the
wheel nut opposite to the wheel nut just previously
tightened until final torque is achieved.
To Stow The Flat Or Spare — If Equipped
Refer to Upfitters Body Builders Guide for information on
stowing your spare tire (if equipped).
HOISTING
A conventional floor jack may be used at the jacking
locations. Refer to the graphics that show jacking locations.
However, a floor jack or frame hoist must never be used on
any other parts of the underbody.
CAUTION!Never use a floor jack directly under the differential
housing of a loaded truck or damage to your vehicle
may result. 6WHAT TO DO IN EMERGENCIES 435