Workshop Repair and Service Manuals GMC SIERRA
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00-03-10-006I Information on Tire Radial Force Variation (RFV) - (Jan 28 2013) Tires - part 2

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If the brakes are applied lightly and the pulsation feltin the steering wheel increases, refer to the Brakes section of the servicemanual that deals with brake-induced pulsation. If you can start to hear the vibrationas a low boom noise (in addition to feeling it), but cannot see it, the vehicle likelyhas a first order (one pulse per propshaft revolution) driveline vibration. Drivelinefirst order vibrations are high enough in frequency that most humans can start tohear them at highway speeds, but are too high to be able to be easily seen. Theseissues can be causedby driveline imbalance or misalignment. If the vehicle exhibits this low boom andthe booming pulses in-and-out on a regular basis (like a throbbing), chances are goodthat the vehicle could have driveline vibration. This type of vibration is normallyfelt more in the “seat of the pants” than the steering wheel.Next, record the Hertz (Hz) reading as displayed by the EVA onto the tire data worksheetfound at the end of this bulletin. This should be done after a tire break-in periodof at least 24-km (15-mi) at 72-km/h (45-mph) or greater, in order to eliminate anypossible tire flat-spotting. This reading confirms what the vehicle vibration frequencyis prior to vehicle service and documents the amount of improvementoccurring as the result of the various steps taken to repair. Completing the SteeringWheel Shake Worksheet below is required. A copy of the completed worksheet must besaved with the R.O. and a copy included with any parts returned to the Warranty PartsCenter for analysis. A reading of 35 to 50 Hz typically indicates a first order propshaftvibration. If this is the situation, refer to the latest version of Corporate BulletinNumber 08-07-30-044.Generally, a reading between 10 and 20 Hz indicates a tire/wheel vibration and ifthis is the reading obtained, continue using this bulletin.

If the tire 1st order vibration goes away and stays away during this evaluation, thecause is likely tire flat-spotting. Tire flat-spotting vibration may come and go atany speed over 72-km/h (45-mph) during the first 10 minutes of operation, if vibrationcontinues after 10 minutesof driving at speeds greater than 72-km/h (45-mph), tire flat-spotting can be ruledout as the cause for vibration.

If flat-spotting is the cause, provide the explanation that this has occurred dueto the vehicle being parked for long periods of time and that the nature of the tireis to take a set. Refer to the latest version of Corporate Bulletin Number 03-03-10-007:Information on Tire/Wheel Characteristics (Vibration, Balance, Shake, Flat Spotting)of GM Original Equipment Tires.If the road test indicates a shake/vibration exists, check the imbalance of each tire/wheelassembly on a known, calibrated, off-car dynamic balancer. Make sure the mounting surface of the wheel and the surface of the balancer are absolutelyclean and free of debris. Be sure to choose the proper cone/collet for the wheel,and always use the pilot bore for centering.
Scrub Radius Description Wheels     Ideally, the scrub radius is as small as possible. Normally,the SAI angle and the centerline of the tire and the wheelintersect below the road surface, causing a positive scrub radius.With struts, the SAI angle is much larger...
09-03-10-013A Statement on Tire Sealant Included in GM Inflator Kits (Supplied with New Vehicles or as GM Accessory) - (Sep 14 2012) Tires     Subject: Statement on Tire Sealant Included in GM Inflator Kits (Supplied with New Vehiclesor as GM Accessory) Models:  2013 and Prior GM Passenger Cars and Light Duty Trucks Equipped with Tire Inflator Kits...
00-03-10-006I Information on Tire Radial Force Variation (RFV) - (Jan 28 2013) Tires - part 3     Never center the wheel using the hub-capboresince it is not a precision machined surface. Perform the centering check if the equipment is capable of a centering check. Ifany assembly calls for more than ? ounce on either rim...
12-03-10-003 Diagnostic Tips for Difficult to Resolve Tire Wheel Vibration Concerns - (Dec 7 2012) - part 2     Proper tire size and type, including if the tires are original equipmentMissing balance weightsVerify tire pressuresDamaged wheelDamaged tireLug nut torqueTire or tire wear irregularitiesMud/ice or other material build-up in...
Propeller Shaft Front Slip Yoke Oil Seal Replacement (Two Wheel Drive) Wheels     Propeller Shaft Front Slip Yoke Oil Seal Replacement Callout Component Name Preliminary ProceduresRaise and support the vehicle. Refer toLifting and Jacking the Vehicle.Remove the propeller shaft. Refer toOne-Piece...
01-03-10-003K GM of Canada New Vehicle Limited Warranty Tire Program and Global Warranty Management (GWM) Submission Information - (Aug 28 2013) Tires - part 6     The only tires that are not to be returned to their respective manufacturers at thistime are Kumho, Maxxis and Pirelli tires. These brand tires should be scrapped inaccordance with GM of Canada's policy stated in section 1.7.3...