GMC Workshop Service and Repair Manuals

5. For the 2500/3500 Sierra/Silverado pick up trucks, measure the (D) height from the jounce bumper cup to the rear axle pad. Refer to Trim Height

Specifications   See: Specifications/Mechanical Specifications/Suspension/System Specifications/Trim Height Specifications.

6. If any of these measurements are out of specifications, inspect for the following conditions:

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Worn or damaged suspension components

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Collision damage