Manufacturer communication — 2006 GMC YUKON DENALI XL

• Applies to 2016 and prior GM passenger cars and light duty trucks.

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  2016 and Prior GM Passenger Cars and Light Duty Trucks

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

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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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   2. 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. A reading of 35 to 50 Hz typically indicates a first order propshaft vibration; 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 any speed 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 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.

4. A vibration heard as a low boom noise as well as felt, but not seen, is likely a first order driveline vibration (one pulse per propshaft revolution).

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   If you can start to hear the vibration as a low boom noise (in addition to feeling it), but cannot see it, the vehicle likely has a first order (one pulse per propshaft revolution) driveline 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 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).

2. After match mounting, rebalance the assembly; if match mounting tires to in-spec wheels still gives values above the guide, tire replacement may be necessary.

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   After match mounting, the tire/wheel assembly must be rebalanced. If match mounting tires to in-spec wheels produces assembly values higher than these, tire replacement may be necessary.

Caution

• Before measuring tires on force variation measurement equipment the vehicle must be driven a minimum of 24 km (15 mi) to remove any flat-spotting.

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  Before measuring tires on GM approved tire force variation measurement equipment, the vehicle MUST be driven a minimum of 24 km (15 mi) to ensure removal of any flat-spotting.

• On the balancer choose the proper cone/collet and always center on the pilot bore; never center the wheel on the hub-cap bore, which is not a precision machined surface.

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  Be sure to choose the proper cone/collet for the wheel, and always use the pilot bore for centering. Never center the wheel using the hub-cap bore since it is not a precision machined surface.