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D Height Measurement

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: The left and right D height difference should be no more than 14 mm (0.55 in). Use the following procedure to measure the D height.
  1. Lift the rear bumper of the vehicle up about 38 mm (1.5 in).
  2. Gently remove your hands and let the vehicle settle.
  3. Repeat this operation 2 more times for a total of 3 times.
    4. Fig 1: Measuring Rear D Height
    GM0000093Courtesy of GENERAL MOTORS CORP.
  4. Measure between the axle bracket and jounce bumper mount bracket as shown in graphic.
  5. Lift the rear bumper of the vehicle up about 38 mm (1.5 in).
  6. Gently remove your hands and let the vehicle settle.
  7. Repeat this operation 2 more times for a total of 3 times.
  8. Re-measure the D height as in step 4.
  9. The true D height is the average of the measurement from step 4 and step 8. The side to side difference in D height must not exceed 14 mm (0.55 in).
  10. If any of these measurements are out of specifications, inspect for the following conditions:
    • Worn or damaged suspension components
    • Collision damage
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