INFORMATION ON FRONT TIRE WEAR AND OR STEERING RETURNABILITY. GMC Truck Jimmy

SUBJECT: INFORMATION ON FRONT TIRE WEAR AND/OR STEERING RETURNABILITY (SET TO NEW ALIGNMENT SPECIFICATION)

MODELS: 1991-95 CHEVROLET AND GMC TRUCK T MODELS 1991-94 OLDSMOBILE BRAVADA

CONDITION:

SOME OWNERS MAY COMMENT ON EXCESSIVE FRONT TIRE WEAR AND/OR STEERING RETURNABILITY.

**PERFORM PRELIMINARY INSPECTION BEFORE ALIGNMENT**

CORRECTION:

THE FOLLOWING PROCEDURES SHOULD BE USED TO ADDRESS CUSTOMER'S CONCERNS ABOUT FRONT TIRE WEAR AND/OR STEERING RETURNABILITY:

1. CHECK TO BE SURE THE TIRE PRESSURE IS SET TO GVW CERTIFICATION/TIRE LABEL SPECIFICATIONS LOCATED ON THE DRIVER'S DOOR LOCK PILLAR.

IMPORTANT: IT IS ESSENTIAL PROPER TIRE ROTATION SCHEDULE BE FOLLOWED AT PROPER INTERVALS TO MINIMIZE TIRE WEAR.

2. 4WD ONLY, FRONT SUSPENSION "Z" HEIGHT DIMENSION AND SETTING MUST BE MADE PRIOR TO ANY OTHER ALIGNMENT CHANGES. 3. PERFORM FRONT WHEEL ALIGNMENT TO THE SPECIFICATIONS IN CHART BELOW:

TO ALIGN SERVICE CHECKING SERVICE SETTING CASTER (PICKUPS 2 DEGREE +/- 1 DEGREE 2 DEGREE +/- 0.5 DEGREE W/ZR2/Z85/ZM6/G51) (B) (E)

CASTER (ALL OTHERS) 3 DEGREE +/- 1 DEGREE 3 DEGREE +/- 0.5 DEGREE (C) (B)

CAMBER (ALL) 0 DEGREE +/- 1 DEGREE 0 DEGREE +/- 0.5 DEGREE (C) (B)

TOTAL TOE (ALL) 0.2 DEGREE +/- 0.2 DEGREE 0.2 DEG. +/- 0.1 DEGREE (D) (D)

NOTICE: VEHICLE MUST BE JOUNCED THREE TIMES BEFORE CHECKING ALIGNMENT TO ELIMINATE FALSE GEOMETRY READINGS.

A. FOR 4WD ONLY, FRONT SUSPENSION "Z" HEIGHT DIMENSION 122 +/- 6.0 MM (4.8 +/- 0.2 INCH), LEFT AND RIGHT SIDE TO BE EQUAL WITHIN 6 MM. B. LEFT AND RIGHT SIDE TO BE EQUAL WITHIN 0.50 DEGREE. C. LEFT AND RIGHT SIDE TO BE EQUAL WITHIN 1.0 DEGREE. D. STEERING WHEEL MUST BE HELD IN STRAIGHT AHEAD POSITION WITH +/- 3.0 DEGREES. FRONT INDIVIDUAL TOE MUST BE EQUALIZED RELATIVE TO REAR WHEEL THRUST ANGLE. E. GVW ALIGNMENT IS THE SAME FOR ALL VEHICLES.

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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.