Manufacturer communication — 2006 GMC YUKON DENALI XL

• 2015 and prior GM passenger cars and light duty trucks.

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  Models: 2015 and Prior GM Passenger Cars and Light Duty Trucks

• The most common ride concern involving tire radial force variation is shake on smooth roads at highway speed, 105-115 km/h (65-70 mph).

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  The most common ride concern involving tire radial force variation is highway speed (105-115 km/h (65-70 mph) shake on smooth roads.

Possible causes

• Tire related smooth road highway speed shake can be caused by three conditions: imbalance, out of round and tire force variation.

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  Tire related smooth road highway speed shake can be caused by three conditions: imbalance, out of round and tire force variation.

Steps to confirm (in the document’s order)

1. With the vehicle raised, center the wheels on the hub by loosening all wheel nuts and hand-tightening them while shaking the wheel, then torque to specification with a torque wrench, not a torque stick.

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   With the vehicle raised, ensure the wheels are centered on the hub by loosening all wheel nuts and hand-tightening all nuts first by hand while shaking the wheel, then torque to specifications using a torque wrench, NOT a torque stick.

2. An EVA reading of 35 to 50 Hz typically indicates a first order propshaft vibration.

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   A reading of 35 to 50 Hz typically indicates a first order propshaft vibration.

3. Generally, a reading between 10 and 20 Hz indicates a tire/wheel vibration; with this reading, continue using this bulletin.

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   Generally, a reading between 10 and 20 Hz indicates a tire/wheel vibration and if this is the reading obtained, continue using this bulletin.

4. Flat-spotting vibration may come and go at any speed over 72 km/h (45 mph) during the first 10 minutes; if it continues after 10 minutes of driving above 72 km/h (45 mph), flat-spotting can be ruled out.

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   Tire flat-spotting vibration may come and go at any speed over 72 km/h (45 mph) during the first 10 minutes of operation, if vibration continues after 10 minutes of driving at speeds greater than 72 km/h (45 mph), tire flat-spotting can be ruled out as the cause for vibration.

5. As a guide, assembly radial force variation should be 24 lbs (11 kg) or less for P-Metric tires on light trucks and 35 lbs (16 kg) or less for LT-tires on light trucks.

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   P-Metric tires on light trucks 24 lbs (11 kg) or less LT-tires on light trucks 35 lbs (16 kg) or less

Repair

1. If any assembly calls for more than 1/4 ounce on either rim flange, remove all balance weights and rebalance to as close to zero as possible.

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   If any assembly calls for more than ¼ ounce on either rim flange, remove all balance weights and rebalance to as close to zero as possible.

2. If one or more tire/wheel assemblies have radial runout of more than 0.040 in (1.02 mm), match mount the tire to the wheel to get below 0.040 in (1.02 mm).

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   If one or more of the tire/wheel assemblies are more than 0.040 in (1.02 mm), match mount the tire to the wheel to get below 0.040 in (1.02 mm).

3. If match mounting tires to in-spec wheels still gives assembly values higher than the guide, tire replacement may be necessary; replacing tires at lower values probably condemns good tires.

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   If match mounting tires to in-spec wheels produces assembly values higher than these, tire replacement may be necessary. Replacing tires at lower values will probably mean good tires are being condemned.

Caution

• Service equipment that removes tread rubber by grinding, buffing or truing is not recommended and may void the tire warranty.

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  Any type of service equipment that removes tread rubber by grinding, buffing or truing is NOT recommended, and may void the tire warranty.