Manufacturer communication — 2006 GMC YUKON DENALI XL

• The model list includes the 1999 - 2006 GMC Yukon, Yukon XL, Yukon Denali and Yukon Denali XL.

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  1999 - 2006 GMC Yukon, Yukon XL, Yukon Denali, Yukon Denali XL

• It applies to vehicles with torsion bar front suspension.

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  With Torsion Bar Front Suspension

• The procedure is for customer complaints of the vehicle leaning left or right, whether the lean appears in the front, the rear, or both ends.

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  This procedure should be followed to diagnose and correct customer complaints of vehicle leaning left or right. The same steps are followed whether the lean appears in the front, rear, or both ends of the vehicle.

Steps to confirm (in the document’s order)

1. Measure the fender wheel-opening heights, front and rear, to quantify the lean.

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   Measure fender wheel-opening heights, front and rear, to quantify vehicle lean.

2. P height and R height are each the distance from the ground to the highest point of the wheel opening, measured through the center of the wheel.

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   P height and R height are measured the same way. They are the distance from the ground to the highest point on their respective wheel-opening, going through the center of their respective wheel.

3. If the left-to-right difference in P and/or R height is 1/2 inch (12 mm) or less, no repairs are suggested because the vehicle is within specification; if it exceeds 1/2 inch (12 mm), follow one of the three diagnostics.

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   If the difference left to right, P and or R height is 1/2 inch (12 mm) or less no repairs are suggested as the vehicle is within specification. If the difference left to right exceeds 1/2 inch (12 mm) follow 1 of the 3 diagnostics below.

Repair

1. Generally the stance can be adjusted with the torsion bar adjuster bolts.

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   stance can be adjusted with the torsion bar adjuster bolts.

2. If Z height is out of spec and the D height difference is greater than 1/2 (12 mm), adjust Z height until it is within spec and the P and R height differences are less than 1/2 inch (12 mm).

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   If Z height is out of spec and D height delta is greater than 1/2 (12 mm), adjust Z height until it is within spec and P and R height deltas are less than 1/2 inch (12 mm).

3. If adjustment is not possible, check the front eye of the rear leaf springs for matching color-coded tape or paint; if the two sides differ, switch the springs side to side, and if they match, replace the leaf spring on the lower side only.

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   check front eye of rear leaf spring for matching color-coded tape or paint. Both sides should be the same color. If not, switch springs side to side. If so, replace leaf spring on lower side only.

4. After all adjustments are done, perform a front-end alignment and check headlight aim.

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   After all adjustments are done, perform a front-end alignment and check headlight aim.

Caution

• Before measuring, set the tire pressures to the pressure shown on the certification label.

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  Set the tire pressures to the pressure shown on the certification label.

• Before measuring, check the fuel level and add weight if necessary to simulate a full tank.

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  Check the fuel level. Add additional weight if necessary to simulate a full tank.

• The P and R heights are not set at the factory, and no specification is given for them.

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  The P and R heights are not set at the factory, nor is a specification given for them.