1999 CHEVROLET SUBURBAN wheel alignment

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6-44
NOTICE:
Don't let anyone tell you that underinflation or
overinflation is all right. It's not. If your tires
don't have enough air (underinflation), you can
get the following:

Too much flexing

Too much heat

Tire overloading

Bad wear

Bad handling

Bad fuel economy.
If your tires have too much air (overinflation),
you can get the following:

Unusual wear

Bad handling

Rough ride

Needless damage from road hazards.
When to Check
Check your tires once a month or more. Also, check the
tire pressure of the spare tire.
How to Check
Use a good quality pocket
-type gage to check tire
pressure. You can't tell if your tires are properly inflated
simply by looking at them. Radial tires may look
properly inflated even when they're underinflated.
Be sure to put the valve caps back on the valve stems.
They help prevent leaks by keeping out dirt and moisture.
Tire Inspection and Rotation
Tires should be rotated every 6,000 to 8,000 miles
(10 000 to 13 000 km). Any time you notice unusual wear,
rotate your tires as soon as possible and check wheel
alignment. Also check for damaged tires or wheels.
See ªWhen It's Time for New Tiresº and ªWheel
Replacementº later in this section for more information.
The purpose of regular rotation is to achieve more
uniform wear for all tires on the vehicle. The first
rotation is the most important. See ªScheduled
Maintenance Servicesº in the Index for scheduled
rotation intervals.

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6-48
Treadwear
The treadwear grade is a comparative rating based on
the wear rate of the tire when tested under controlled
conditions on a specified government test course. For
example, a tire graded 150 would wear one and a half
(1 1/2) times as well on the government course as a tire
graded 100. The relative performance of tires depends
upon the actual conditions of their use, however, and
may depart significantly from the norm due to variations
in driving habits, service practices and differences in
road characteristics and climate.
Traction
-- AA, A, B, C
The traction grades, from highest to lowest, are AA, A, B,
and C. Those grades represent the tire's ability to stop on
wet pavement as measured under controlled conditions on
specified government test surfaces of asphalt and concrete.
A tire marked C may have poor traction performance.
Warning: The traction grade assigned to this tire is based
on straight ahead braking traction tests, and does not
include acceleration, cornering, hydroplaning, or peak
traction characteristics.
Temperature
-- A, B, C
The temperature grades are A (the highest), B, and C,
representing the tire's resistance to the generation ofheat and its ability to dissipate heat when tested under
controlled conditions on a specified indoor laboratory
test wheel. Sustained high temperature can cause the
material of the tire to degenerate and reduce tire life, and
excessive temperature can lead to sudden tire failure.
The grade C corresponds to a level of performance
which all passenger car tires must meet under the
Federal Motor Vehicle Safety Standard No. 109. Grades
B and A represent higher levels of performance on the
laboratory test wheel than the minimum required by law.
Warning: The temperature grade for this tire is
established for a tire that is properly inflated and not
overloaded. Excessive speed, underinflation, or
excessive loading, either separately or in combination,
can cause heat buildup and possible tire failure.
Wheel Alignment and Tire Balance
The wheels on your vehicle were aligned and balanced
carefully at the factory to give you the longest tire life
and best overall performance.
Scheduled wheel alignment and wheel balancing are not
needed. However, if you notice unusual tire wear or
your vehicle pulling one way or the other, the alignment
may need to be reset. If you notice your vehicle
vibrating when driving on a smooth road, your wheels
may need to be rebalanced.

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9-1
Section 9 Index
A
ir Bag 1-29 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adding Equipment 1-36 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
How Does it Restrain 1-33 . . . . . . . . . . . . . . . . . . . . . . . . . .
How it Works 1-31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Location 1-31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Readiness Light 1-31, 2-73 . . . . . . . . . . . . . . . . . . . . . . . . .
Servicing 1-35 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
What Makes it Inflate 1-33 . . . . . . . . . . . . . . . . . . . . . . . . . .
What Will You See After it Inflates 1-33 . . . . . . . . . . . . . . .
When Should it Inflate 1-32 . . . . . . . . . . . . . . . . . . . . . . . . .
Air Cleaner 6-16, 6-68 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air Cleaner Filter Restriction Indicator Check 7-39 . . . . . . . .
Air Conditioning 3-3, 3-4, 3-7 . . . . . . . . . . . . . . . . . . . . . . . .
Air Conditioning Refrigerants 6-68 . . . . . . . . . . . . . . . . . . . . .
Alignment and Balance, Tire 6-48 . . . . . . . . . . . . . . . . . . . . . .
Aluminum Wheels, Cleaning 6-56 . . . . . . . . . . . . . . . . . . . . . .
Antenna, Fixed 3-30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Antifreeze 6-25, 7-44 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Anti-Lock, Brake System Warning Light 2-75, 4-7 . . . . . . . .
Anti-Lock, Brakes 4-7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Anti-Theft, Radio 3-24 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appearance Care 6-51 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appearance Care and Materials 6-58 . . . . . . . . . . . . . . . . . . . .
Arbitration Program 8-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Armrest Storage Compartment 2
-58 . . . . . . . . . . . . . . . . . . . .
Ashtrays 2-62 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Audio Equipment, Adding 3-27 . . . . . . . . . . . . . . . . . . . . . . . .
Audio Systems 3-10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Automatic Transmission
Check 7
-39 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fluid 6-19, 7-44 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operation 2-16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overdrive 2-18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Park Mechanism Check 7-41 . . . . . . . . . . . . . . . . . . . . . . . .
Shifting 2-16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Auxiliary Power Outlet 2-63 . . . . . . . . . . . . . . . . . . . . . . . . . .
Axle, Front 6-24, 7-45 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Axle, Locking Rear 2-31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Axle, Rear 6-22, 7-45 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery 6-34 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Jump Starting 5-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacement, Keyless Entry 2-7 . . . . . . . . . . . . . . . . . . . . .
Warnings 5-3, 5-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BBB Auto Line 8-3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Better Business Bureau Mediation 8-3 . . . . . . . . . . . . . . . . . . .
Blizzard 4-40 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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9-10
Service and Appearance Care 6-1 . . . . . . . . . . . . . . . . . . . . . .
Service and Owner Publications 8-11, 8-12 . . . . . . . . . . . . . .
Service Four-Wheel Drive Warning Light 2-80 . . . . . . . . . . . .
Service Publications 8-11, 8-12 . . . . . . . . . . . . . . . . . . . . . . . .
Servicing Your Air Bag-Equipped Vehicle 1-35 . . . . . . . . . . .
Sheet Metal Damage 6-57 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shift Lever 2-16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shifting
Automatic Transmission 2
-16 . . . . . . . . . . . . . . . . . . . . . . .
Into Park (P) 2-26 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Out of Park (P) 2-28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Shoulder Belt Height Adjuster 1-22, 1-40 . . . . . . . . . . . . . . . .
Signaling Turns 2-34 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Skidding 4-13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sound Equipment, Adding 3-27 . . . . . . . . . . . . . . . . . . . . . . . .
Specifications and Capacities 6-67 . . . . . . . . . . . . . . . . . . . . . .
Specifications, Engine 6-67 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Speech Impaired, Customer Assistance 8-4 . . . . . . . . . . . . . . .
Speedometer 2-71 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Speed-Sensitive Steering 4-9 . . . . . . . . . . . . . . . . . . . . . . . . . .
Stains, Cleaning 6-52 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Starter Switch Check 7-40 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Starting Your Engine 2-13 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Steam 5-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Steering 4-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
In Emergencies 4-10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power 4-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Speed-Sensitive 4-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tips 4-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wheel, Tilt 2-33 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Step-Bumper Pad 4-59 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage Compartments 2-53 . . . . . . . . . . . . . . . . . . . . . . . . . . . Storage, Overhead 2
-53 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage, Vehicle 6-34 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stuck: In Sand, Mud, Ice or Snow 5-36 . . . . . . . . . . . . . . . . . .
Sun Visors 2-64 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sunglasses Storage 2-55 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Symbols, Vehicle v. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tachometer 2-71 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tailgate 2-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tailgate, Glass Release 2-33 . . . . . . . . . . . . . . . . . . . . . . . . . .
Tape Player Care 3-28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Theft 2-10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Theft-Deterrent Feature 3-24 . . . . . . . . . . . . . . . . . . . . . . . . . .
THEFTLOCK
3-24 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermostat 6-25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Third Gear, Automatic Transmission 2-18 . . . . . . . . . . . . . . . .
Tilt Steering Wheel 2-33 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Time, Setting the 3-10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tire Chains 6-50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tire Loading 4-44 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tire-Loading Information Label 4-44 . . . . . . . . . . . . . . . . . . .
Tires 6-43 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Alignment and Balance 6-48 . . . . . . . . . . . . . . . . . . . . . . . .
Buying New 6-46 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chains 6-50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Changing a Flat 5-19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cleaning 6-56 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inflation 6-43 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inflation Check 7-38 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection and Rotation 6-44 . . . . . . . . . . . . . . . . . . . . . . . .
Loading 4-44 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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9-12
Warning Devices 5-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Warning Lights, Gages and Indicators 2-72 . . . . . . . . . . . . . . .
Warranty Information 8-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Washer Fluid, Windshield 6-29, 7-44 . . . . . . . . . . . . . . . . . . .
Washing Your Vehicle 6-55 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Weatherstrips 6-54 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wheel
Alignment 6
-48 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Nut Torque 5-30, 6-67 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Replacement 6-49 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Used Replacement 6-50 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wrench 5-22, 5-23 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Window Lock 2-32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Windows 2-31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lockout Switch 2-32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Manual 2-31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power 2-31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Windshield Washer 2
-36 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fluid 2-36, 6-29, 7-44 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fluid Level Check 7-38 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear 2-36 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Windshield Wipers 2-35 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Blade Replacement 6-42, 6-68 . . . . . . . . . . . . . . . . . . . . . .
Cleaning the Blades 6-54 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuses 6-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear 2-36 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Winter Driving 4-38 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wiper Blade Check 7-39 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wiper Blades, Cleaning 6-54 . . . . . . . . . . . . . . . . . . . . . . . . . .
Wiring Harness, Trailer 4-57 . . . . . . . . . . . . . . . . . . . . . . . . . .
Wiring, Headlamp 6-60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wrecker Towing 5-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wrench, Wheel 5-22, 5-23 . . . . . . . . . . . . . . . . . . . . . . . . . . . .