(10)= Inspect rear axle air shift motor for fluid leaks.
Remove plug to check fluid level. Inspect air lines and
hoses for proper hook-up, binding, leaks, etc. Inspect at
1,000 miles (1 600 km) and 22,500 miles (36 000 km)
and then every 22,500 miles (36 000 km) thereafter.
(11)= Chassis Lubrication Service: Lubricate all grease
fittings in front suspension, front axle, and steering
linkage. DO NOT lubricate kingpin bushings with
air pressure equipment; instead, use a hand grease gun
to ensure complete purge and eliminate sealer cap
distortion. Front axle tie rod ends, both upper and lower
kingpin fittings, and both steering linkage relay rod
ends should be greased with the vehicle loaded on the
ground and wheels turned straight ahead, NOT with
the vehicle on a hoist. Apply kingpin bushing lubricant to
both upper and lower kingpin grease fittings until new
lubricant purges from between the upper shim pack and
thrust bearing. Lubricate transmission and shift
linkage, hood latches and hood hinges, parking brake
lever pivot, clevis pins and linkage, disc brake caliper
rails, clutch linkage and release bearing (if equipped),
bearing pads, propshaft universal joints, brake camshaft
bracket, slack adjusters, pedal shaft, clutch cross
shaft, clutch pedal springs, and clutch cable bushing at
transmission. Lubricate suspension, axle, and steering
linkage more often when operating under dusty or
muddy conditions and in excessive off-road use.
Frequently power-washed vehicles will require more
frequent lubrication.(12)= Check steering system:
•Look for damaged, loose, or missing parts. Inspect
the steering linkage relay rod and tie rod ends for
looseness or lack of lubricant. Also look for
parts showing signs of wear or lack of lubrication.
Replace parts as needed. Also check steering gear
mounting bolts, pitman arm nut, gear housing
upper cover and side cover attaching bolts, steering
column mounting bolts and cardan joint clamp
bolts; tighten if necessary. See the service manual.
•Inspect power steering hoses, tubes, and fittings for
leaks. Hoses and lines must not be twisted, kinked,
or tightly bent. Make sure clips, clamps, supporting
tubes, and hoses are in place and properly
secured.
•Check steering gear for leakage around pitman
shaft and housing. If leakage is evident (lubricant
oozing out, not just oily film), leak should be
corrected immediately.
(13)= Check front and rear suspension. Look for
damaged, loose, or missing parts or parts showing signs
of wear or lack of lubrication. Replace parts as
needed.
6-23
Reporting Safety Defects to General
Motors
In addition to notifying NHTSA (or Transport Canada) in
a situation like this, we certainly hope you’ll notify us.
Please call us at 1-800-862-4389, or write:
GM Medium Duty Truck
Customer Assistance Center
P.O. Box 44947
Detroit, MI 48244
In Canada, please call us at 1-800-263-3777 (English)
or 1-800-263-7854 (French). Or, write:
General Motors of Canada Limited
Customer Communication Centre, 163-005
1908 Colonel Sam Drive
Oshawa, Ontario L1H 8P7
Service Publications Ordering
Information
Service Manuals
Service Manuals have the diagnosis and repair
information on engines, transmission, axle suspension,
brakes, electrical, steering, body, etc.
Transmission, Transaxle, Transfer
Case Unit Repair Manual
This manual provides information on unit repair
service procedures, adjustments, and specifications for
GM transmissions, transaxles, and transfer cases.
7-8
A
Accessory Power Outlets.................................3-19
Adding a Snow Plow or Similar Equipment.........4-34
Adding Equipment to Your Airbag-Equipped
Vehicle.......................................................1-59
Additives, Fuel................................................. 5-6
Add-On Electrical Equipment............................5-88
Air Brake.......................................................2-40
Air Cleaner/Filter, Engine.................................5-33
Air Conditioning..............................................3-20
Air Conditioning System...................................5-70
Air Pressure Gage..........................................3-44
Air Shift Control..............................................2-27
Air Suspension...............................................2-42
Air Suspension Seats........................................ 1-6
Airbag
Off Light.....................................................3-28
Readiness Light..........................................3-27
Airbag Sensing and Diagnostic Module (SDM)...... 7-6
Airbag System................................................1-48
Adding Equipment to Your Airbag-Equipped
Vehicle...................................................1-59
Airbag Off Switch........................................1-56
How Does an Airbag Restrain?......................1-54
Servicing Your Airbag-Equipped Vehicle..........1-59
What Makes an Airbag Inflate?......................1-54
What Will You See After an Airbag Inflates?....1-54Airbag System (cont.)
When Should an Airbag Inflate?....................1-53
Where Are the Airbags?...............................1-52
AM-FM Radio.................................................3-45
Antenna, Fixed Mast.......................................3-59
Anti-Lock Brake System (ABS)........................... 4-6
Anti-Lock Brake, System Warning Light..............3-34
Anti-Lock Brakes, Trailer System
Warning Light.............................................3-34
Appearance Care............................................5-79
Aluminum or Chrome-Plated Wheels..............5-84
Care of Safety Belts....................................5-82
Chemical Paint Spotting...............................5-85
Cleaning Exterior Lamps/Lenses....................5-83
Cleaning the Inside of Your Vehicle................5-80
Fabric/Carpet..............................................5-81
Finish Care.................................................5-83
Finish Damage............................................5-85
Instrument Panel, Vinyl, and Other Plastic
Surfaces.................................................5-82
Sheet Metal Damage...................................5-85
Tires..........................................................5-85
Underbody Maintenance...............................5-85
Vehicle Care/Appearance Materials................5-86
Washing Your Vehicle...................................5-83
Weatherstrips..............................................5-82
Windshield and Wiper Blades........................5-84
Ashtrays........................................................3-20
1
Reading Lamps..............................................3-17
Rear Axle......................................................5-60
Differential Lock Control................................. 4-9
Shift Motor.................................................5-62
Two-Speed Electric Shift Control....................2-26
Rear Heating System......................................3-24
Rear Seat Operation......................................... 1-8
Rear Seat Passengers, Safety Belts..................1-24
Rearview Mirrors.............................................2-45
Reclining Seatbacks.......................................... 1-4
Reduced Engine Power Light............................3-41
Remote Keyless Entry System............................ 2-3
Remote Keyless Entry System, Operation............ 2-4
Reporting Safety Defects
Canadian Government................................... 7-7
General Motors............................................. 7-8
United States Government.............................. 7-7
Restraint System Check
Checking the Restraint Systems....................1-60
Replacing Restraint System Parts
After a Crash..........................................1-60
Right Front Passenger Position, Safety Belts......1-22
Roadside
Assistance Program....................................... 7-5
Rocking Your Vehicle to Get it Out....................4-30
Running Out of Fuel........................................5-15
Running the Engine While Parked.....................2-44S
Safety Belt
Reminder Light............................................3-27
Reminder Tone............................................3-27
Safety Belts
Care of......................................................5-82
Center Passenger Position............................1-22
Driver Position............................................1-14
How to Wear Safety Belts Properly................1-14
Questions and Answers About Safety Belts.....1-13
Rear Seat Passengers.................................1-24
Right Front Passenger Position......................1-22
Safety Belt Extender....................................1-26
Safety Belt Use During Pregnancy.................1-22
Safety Belts Are for Everyone......................... 1-9
Shoulder Belt Height Adjuster........................1-21
Safety Warnings and Symbols.............................. iii
Scheduled Maintenance..................................... 6-5
Scheduled Maintenance Supplements.................. 6-5
Seats
Air Suspension Seats.................................... 1-6
Manual........................................................ 1-2
Rear Seat Operation...................................... 1-8
Reclining Seatbacks...................................... 1-4
Split Bench Seat........................................... 1-6
11
Securing a Child Restraint
Center Rear Seat Position (Crew Cab) or
Center Front Position................................1-42
Rear Outside Seat Position...........................1-40
Right Front Seat Position..............................1-44
Service........................................................... 5-3
Doing Your Own Work................................... 5-4
Engine Soon Light.......................................3-36
Publications Ordering Information..................... 7-8
Transmission Warning Light..........................3-31
Two Safety Cautions about Engine Fan
Breakage.................................................. 5-5
Servicing Your Airbag-Equipped Vehicle..............1-59
Setting the Time.............................................3-45
Sheet Metal Damage.......................................5-85
Shoulder Belt Height Adjuster...........................1-21
Signals, Turn and Lane-Change.......................... 3-8
Sliding Rear Windows.....................................2-10
Snow Plow....................................................4-34
Specifications, Capacities.................................5-95
Speedometer..................................................3-26
Split Bench Seat.............................................. 1-6
Starting Your Diesel Engine..............................2-14
Starting Your Gasoline Engine..........................2-12
Steering........................................................4-11
Steering Wheel, Tilt Wheel................................. 3-7Storage Areas................................................2-47
Center Console Storage Area........................2-47
Stuck in Sand, Mud, Ice or Snow......................4-30
Sun Visors.....................................................2-10
Suspension, Air..............................................2-42
Switchbanks, Instrument Panel..........................3-18
T
Tachometer....................................................3-26
Theft-Deterrent, Radio.....................................3-57
Tilt Wheel........................................................ 3-7
Tires.............................................................5-70
Aluminum or Chrome-Plated Wheels,
Cleaning.................................................5-84
Cleaning....................................................5-85
Dual Tire Operation.....................................5-72
If a Tire Goes Flat.......................................5-78
Inflation -- Tire Pressure...............................5-71
Tightening the Wheel Nuts............................5-73
Wheel Alignment and Tire Balance.................5-73
Wheel Loading............................................5-71
Wheel Replacement.....................................5-77
When It Is Time for New Tires......................5-72
Top Strap......................................................1-39
Tow Hooks.....................................................4-31
12