Section 6 Service and Appearance Care
Rear Axle. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-48
Four-Wheel Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-50
Front Axle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-52
Noise Control System . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-53
Tampering with Noise Control
System Prohibited . . . . . . . . . . . . . . . . . . . . . . . . . . 6-53
Headlamp Aiming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-54
Bulb Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-57
Halogen Bulbs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-57
Headlamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-57
Center High-Mounted Stoplamp (CHMSL) and Cargo Lamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-58
Pickup Box Identification and Fender Marker Lamps . . . . . . . . . . . . . . . . . . 6-59
Taillamps, Turn Signal, Stoplamps and Back-up Lamps . . . . . . . . . . . . . . . . . . . . . . . . 6-60
License Plate Lamp . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-62
Replacement Bulbs . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-62
Windshield Wiper Blade Replacement . . . . . . . . . . .6-63Tires
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-64
Tire Sidewall Labeling . . . . . . . . . . . . . . . . . . . . . . . . . 6-65
Tire Terminology and Definitions . . . . . . . . . . . . . . . 6-70
Inflation - Tire Pressure . . . . . . . . . . . . . . . . . . . . . . . . 6-72
High-Speed Operation . . . . . . . . . . . . . . . . . . . . . . . . . 6-74
Dual Tire Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-74
Tire Pressure Monitor System . . . . . . . . . . . . . . . . . 6-75
Tire Pressure Monitor Operation . . . . . . . . . . . . . . . 6-76
Tire Inspection and Rotation . . . . . . . . . . . . . . . . . . . 6-80
When It Is Time for New Tires . . . . . . . . . . . . . . . . . 6-82
Buying New Tires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-83
Different Size Tires and Wheels . . . . . . . . . . . . . . . 6-85
Uniform Tire Quality Grading . . . . . . . . . . . . . . . . . . . 6-85
Wheel Alignment and Tire Balance . . . . . . . . . . . . 6-87
Wheel Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-87
Tire Chains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-89
If a Tire Goes Flat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-89
Changing a Flat Tire . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-90
Removing the Spare Tire and Tools . . . . . . . . . . . . 6-92
Removing the Flat Tire and Installing the Spare Tire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-97
Secondary Latch System . . . . . . . . . . . . . . . . . . . . . 6-103
Storing a Flat or Spare Tire and Tools . . . . . . . . 6-106
Spare Tire . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-109
6-2
.For all 6.0L and 6.2L 2500HD Series applications,
the proper level is from 0 to 0.5 inches (0 mm to
13 mm) below the bottom of the filler plug hole,
located on the rear axle. Add only enough fluid to
reach the proper level.
.For all 6.6L DURAMAX DIESEL 2500HD Series
applications and all 3500 Series applications, the
proper level is from 0.6 inches to 0.8 inches
(17 mm to 21 mm) below the bottom of the filler
plug hole, located on the rear axle. Add only
enough fluid to reach the proper level.
What to Use
Refer to the Maintenance Schedule to determine what
kind of lubricant to use. SeeRecommended Fluids and
Lubricants on page 7‑12.
Four-Wheel Drive
Lubricant checks in this section also apply to these
vehicles.
Transfer Case
When to Check Lubricant
It is not necessary to regularly check transfer case fluid
unless you suspect there is a leak, or you hear an
unusual noise. A fluid loss could indicate a problem.
Have it inspected and repaired.
How to Check Lubricant
Electric Shift Transfer Case
A. Fill Plug
B. Drain Plug
6-50
