Manufacturer communication — 2006 GMC YUKON DENALI XL

• Applies to 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 has three possible causes — imbalance, out of round, and tire force variation — which are not necessarily related; all three must be addressed.

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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. These three conditions are not necessarily related. All three conditions must be addressed.

Steps to confirm (in the document’s order)

1. With the vehicle raised, center the wheels on the hub: loosen all wheel nuts, hand-tighten 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. On the road test, a reading of 35 to 50 Hz typically indicates a first order propshaft vibration, and a reading between 10 and 20 Hz generally indicates a tire/wheel vibration.

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   A reading of 35 to 50 Hz typically indicates a first order propshaft vibration. Generally, a reading between 10 and 20 Hz indicates a tire/wheel vibration and if this is the reading obtained, continue using this bulletin.

3. Flat-spotting vibration may come and go at speeds over 72 km/h (45 mph) during the first 10 minutes; if it continues after 10 minutes above 72 km/h (45 mph), flat-spotting is 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.

4. Guide values for assembly radial force variation: P-metric tires on light trucks 24 lbs (11 kg) or less, LT tires on light trucks 35 lbs (16 kg) or less.

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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. Check each tire/wheel assembly on a calibrated off-car dynamic balancer; if any assembly calls for more than 1/4 ounce on either rim flange, remove all weights and rebalance 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 the radial runout of a tire/wheel assembly is 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 to in-spec wheels still gives values above the guide, tire replacement may be necessary; replacing tires at lower values will probably condemn 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

• Before measuring, the vehicle must be driven at least 24 km (15 mi) to remove any flat-spotting.

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  the vehicle MUST be driven a minimum of 24 km (15 mi) to ensure removal of any flat-spotting.

• 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.