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Front Seats......................................................1-2
Manual Seats................................................1-2
Reclining Seatbacks........................................1-4
Split Bench Seat (80/20 Split)..........................1-6
Air Suspension Seats......................................1-6
Rear Seats.......................................................1-8
Rear Seat Operation.......................................1-8
Safety Belts.....................................................1-9
Safety Belts: They Are for Everyone.................1-9
Questions and Answers About Safety Belts......1-13
How to Wear Safety Belts Properly.................1-14
Driver Position..............................................1-14
Shoulder Belt Height Adjustment.....................1-21
Safety Belt Use During Pregnancy..................1-22
Right Front Passenger Position.......................1-22
Center Passenger Position.............................1-22
Rear Seat Passengers..................................1-24
Safety Belt Extender.....................................1-26
Child Restraints.............................................1-27
Older Children..............................................1-27
Infants and Young Children............................1-30
Child Restraint Systems.................................1-33
Where to Put the Restraint
(Regular Cab Models)................................1-36Where to Put the Restraint
(Crew Cab Models)....................................1-38
Top Strap....................................................1-39
Securing a Child Restraint in a Rear Outside
Seat Position (Crew Cab Models)................1-40
Securing a Child Restraint in the Center
Rear Seat Position (Crew Cab) or Center
Front Position...........................................1-42
Securing a Child Restraint in the Right Front
Seat Position............................................1-44
Airbag System...............................................1-48
Where Are the Airbags?................................1-52
When Should an Airbag Inflate?.....................1-53
What Makes an Airbag Inflate?.......................1-54
How Does an Airbag Restrain?.......................1-54
What Will You See After an Airbag Inflates?.....1-54
Airbag Off Switch..........................................1-56
Servicing Your Airbag-Equipped Vehicle...........1-59
Adding Equipment to Your Airbag-Equipped
Vehicle....................................................1-59
Restraint System Check..................................1-60
Checking the Restraint Systems......................1-60
Replacing Restraint System Parts
After a Crash............................................1-60
Section 1 Seats and Restraint Systems
1-1
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{CAUTION:
If the seatback is not locked, it could move
forward in a sudden stop or crash. That could
cause injury to the person sitting there. Always
press rearward on the seatback to be sure it
is locked.
Lumbar Adjustments
The lumbar adjustment
knob is located on the
seatback, on the inboard
side of the driver’s seat and
on the outboard side of the
passenger’s seat.
For more support to your lower back, turn the lumbar
adjustment knob clockwise. To decrease the amount of
lumbar support, turn the knob counterclockwise.
Seatback Adjustment
The seatback adjustment
knob is located on the
inboard side of the
driver’s and passenger’s
seat cushions.
To tilt the seatback rearward, turn the knob
counterclockwise. Turn the knob clockwise to tilt the
seat forward.
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Fore-and-Aft Adjustment
The fore-and-aft
adjustment lever is
located underneath the
seat, in the front.
To slide the seat forward or rearward, move the lever
toward the driver’s door. The seat will lock in at 1/2 inch
(1.5 cm) increments.
{CAUTION:
If the seatback is not locked, it could move
forward in a sudden stop or crash. That could
cause injury to the person sitting there. Always
press rearward on the seatback to be sure it
is locked.
Reclining Seatbacks
If your vehicle has non-suspension bucket seats, you
can recline the seatbacks. The lever is located on
the outboard side of the seat cushion.
To recline the seatback, lift the lever and use your body
to move the seatback. Release the lever to lock the
seatback where you want it. Lean forward and pull up on
the lever to return the seatback to an upright position.
1-4
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The seat cushion can also be raised or lowered.
The seat cushion height
adjustment handle is
located underneath the
front of the seat.
To adjust the height of the cushion, lift the handle up and
pull it forward. You can choose between two settings.Chugger-Snubber Lock-Out Feature
If your vehicle has this
feature, the handle is
located on the outboard
side of the driver’s
and passenger’s seats.
Move the handle down to reduce any backslap
experienced while in tractor/trailer operation or while
operating a dump truck application.
1-7
Page 338 of 374

(14)= Adjust tire pressures as indicated on the Gross
Vehicle Weight (GVW) Rating label for optimum tire life.
SeeTires on page 5-70for further details. Check
tires for excessive or abnormal wear or damage. Also
check for damaged wheels. Replace wheels and/or tires
as needed.
(15)= Check spring-to-axle U-bolts and shackle bolts
for proper torque. See the service manual for torque
sequence and specifications. When parts are replaced,
the torque must be checked and adjusted more often
during the first 6,000 miles (10 000 km). Check torque at
500 miles (800 km) and 2,000 miles (3 000 km) after
first use of parts.
(16)= Check complete exhaust system and cab areas
near the exhaust system for broken, damaged,
missing, or out-of-position parts. Also inspect for open
seams, holes, loose connections, or other conditions
which could let exhaust fumes seep into the driver
compartment. Needed repairs should be made at once.
To help maintain system integrity, replace exhaust
pipes whenever a new muffler is put on.
(17)= Check all gasoline engine drive belts for cracks,
fraying, and wear. Replace as needed.
(18)= Adjust valve lash. Incorrect valve clearance
will result in increased engine noise and reduced engine
output.(19)= With the engine off and below normal operating
temperature, check to see that the thermostatically
controlled engine cooling fan can be rotated by hand on
viscous-operated drives. Replace as needed.
(20)= Check shields and underhood insulation for
damage or looseness. Adjust or replace as needed.
(21)= Inspect parking brake drum and linings for wear
or cracks and check linkage and adjustment.
(22)= Wheel bearing service:
•Grease type — Clean, inspect, and lubricate with
the proper wheel bearing grease at designated
intervals or when hubs are removed. SeePart C:
Recommended Fluids and Lubricants on page 6-32.
•Oil-filled type — Some wheel bearings are
lubricated by rear axle lubricant. When you have
oil-filled hubs, use lubricant identical to that used in
your rear axle. Lubricant change intervals are
the same for front and rear axles. However, you
must maintain the proper oil level between change
intervals. SeeFront Wheel Bearings with Oil-Filled
Hubs on page 5-69andPart C: Recommended
Fluids and Lubricants on page 6-32.
(23)= Check the air intake system installation to see
that gaskets are seated properly and all hose
connections, fasteners, and other components are tight.
Tighten connections and fasteners or replace parts
as required.
6-24