Manufacturer communication — 2006 GMC YUKON DENALI XL

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

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  Models: 2016 and Prior GM Passenger Cars and Light Duty Trucks

Possible causes

• Lead/pull concerns can be due to road crown or road slope, tires, wheel alignment or, in rare circumstances, a steering gear issue.

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  Lead/Pull concerns can be due to road crown or road slope, tires, wheel alignment or even in rare circumstances a steering gear issue.

Steps to confirm (in the document’s order)

1. Verify that no aftermarket suspension lift or lowering kits or other suspension alterations have been done to the vehicle.

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   Verify that aftermarket suspension “Lift” or “Lowering” Kits or other suspension alterations have NOT been done to the vehicle.

2. Jounce the front and the rear bumpers 3 times prior to checking the wheel alignment.

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   Jounce the front and the rear bumpers 3 times prior to checking the wheel alignment.

3. For a verified steering wheel angle complaint, front and rear toe are the only alignment values that affect the angle of the steering wheel.

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   If a steering wheel angle complaint has been verified, it should be noted that front and rear toes are the only alignment values that affect the angle of the steerin wheel.

4. A positive front cross camber (LH minus RH) pulls left and a negative value pulls right; a positive front cross caster (LH minus RH) pulls right and a negative value pulls left.

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   Alignment Settings: Positive Value Negative Value Front Cross Camber (LH minus RH) Pulls Left Pulls Right Front Cross Caster (LH minus RH) Pulls Right Pulls Left

5. Swapping the front tires left to right and re-evaluating is a simple way to verify a tire issue.

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   Swapping the front tires left to right and re-evaluating is a simple way to verify a tire issue.

Repair

• On vehicles requiring a 4-wheel alignment, set the rear wheel alignment angles first in order to obtain proper front wheel alignment angles.

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  When performing adjustments to vehicles requiring a 4-wheel alignment, set the rear wheel alignment angles first in order to obtain proper front wheel alignment angles.

Caution

• Slight or mild feathering, cupping, edge or heel/toe wear of the tire tread shoulders is normal and does not affect the overall performance and tread life of the tire.

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  Slight or mild feathering, cupping, edge or heel/toe wear of tire tread shoulders is “normal” and can show up very early in a tire/vehicle service mileage; in fact, some new tires can show evidence of feathering from the factory. These issues do NOT affect the overall performance and tread life of the tire.

• In general, wheel alignments are not to be performed as an investigation or correction for vibration concerns.

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  In general, wheel alignments are NOT to be performed as an investigation/correction for vibration concerns.

• Front or rear toe values being out of specification do not cause a true vehicle pull.

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  Front or rear toe values being out of specifications do not cause a true vehicle pull.

• Adjusting alignment settings will not improve tramlining (the tendency to follow ruts and grooves in the road).

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  It should be noted that adjusting alignment settings will NOT improve this condition.