GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1998 🢒 Corvette 🢒 Suspension 🢒 Wheel Alignment 🢒 Tire Diagnosis

Object Number: 65369 Size: SF

The following are some causes for irregular and premature wear:

    • An incorrect tire inflation pressure.
    • A lack of tire rotation.
    • Harsh driving habits.
    • An incorrect wheel alignment.
    • A faulty tire (radial belts).
    • A damaged shock.
    • A worn shock.
    • An unbalanced tire.
    • A damaged wheel.
    • A damaged rotor.
    • A damaged axle shaft.
    • A worn rotor.
    • A worn axle shaft.

Inspection Procedure

Rotate the tire and wheel if the following conditions are noted:

    • The front tire wear is different from the rear tire wear.
    • An uneven wear exists across the tread of any tire.
    • The left front and the right front tire wear is unequal.
    • The left rear and the right rear tire wear is unequal.

Check the wheel alignment if the following conditions are noted:

    • The left and the right front tire wear is irregular.
    • The wear is uneven across the tread of any front tire.
    • The front tire treads have a scuffed appearance with feathered edges on one side of the tread ribs or the blocks.

Tread Wear Indicators
Object Number: 65344 Size: SH

Built-in tread wear indicators are equipped on the original tires. The built-in tread wear indicators show when tires need replacement. The indicators appear in 6 places (every 60) around the tire when the tread is worn to 2/32 inch. Tire replacement is recommended when the indicators appear in 3 or more locations (1).

Vibration Diagnosis

Step

Action

Yes

No

1

Road test the vehicle to verify complaint.

Is vibration present?

Go to Step 2

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2

Visually inspect the wheels and the tires for debris or road damage

Are the wheels free of debris and road damage?

Go to Step 3

Go to Step 4

3
  1. Remove debris from the wheels.
  2. Repair or replace road damaged wheels or tires as necessary.

Is repair complete?

System OK

--

4

Is vibration present above 64 km/h (40 mph)?

Go to Step 5

Go to Step 6

5

Perform off vehicle dynamic balance.

Is vibration still present?

Go to Step 7

System OK

6

Is vibration present below 64 km/h (40 mph)?

Go to Step 7

Go to Step 9

7

Perform on vehicle runout check.

Is runout excessive?

Go to Step 8

Go to Step 9

8
  1. Perform off vehicle runout check.
  2. Measure tire and wheel separately to determine which is out of specification.
  3. Replace tire or wheel as necessary.

Is the vibration still present?

Go to Step 10

System OK

9

Index assembly on wheel studs.

Is vibration still present?

Go to Step 11

--

10

Perform on vehicle finish balance.

Is vibration still present?

Go to Step 12

System OK

11

Measure axle or hub flange runout.

Is runout excessive?

Go to Step 12

System OK

12

Replace the axle shaft or replace the hub as necessary.

Is the repair complete?

System OK

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