IRREGULAR REAR TIRE WEAR TIRE NOISE / ROUGHNESS

1984-86 6000 MODELS

"Please discard previous bulletin 86-3-3 due to this revision which limits this bulletin to above vehicles with 'all seasons tires', only."

Some 1984-86 6000 models may develop an irregular wear pattern on the rear tires. This condition may cause tire noise and/or tire roughness due to the heel and toe (high and low) wear pattern on individual tread blocks. A diagonal wear pattern may also become evident across the face of the tread.

If an irregular wear condition is encountered for the above vehicles with 'all seasons tires' (MS rating) only, the following procedure should be followed:

1. Install shim kit. Follow instructions included in the kit.

CAUTION:

Use only GM P/N 14094481, shim kit. Use of other parts may cause bolt torque loss which could result in the loss of a wheel and resulting damage and/or personal injury.

2. If tires are replaced, put the two (2) new tires on the front and move the front tires to the rear positions. After 7,500 miles, tires should be rotated following the modified "X" pattern (see illustration).

3. If the tires are not replaced, rotate the tires using the modified 'X' pattern (see illustration).

PARTS REQUIRED

One (1) shim kit (P/N 14094481).

Kit includes: Two (2) shims (P/N 14094467). Eight (8) bolts (P/N 25519720). One (1) Instruction Sheet (P/N 14094482).

Labor Operation Number : T1141 Labor Time : .7 hours

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.