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D Height Measurement

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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. Jounce the rear suspension several times to obtain at least 38 mm (1.5 in) deflection, then allow the vehicle to settle.
    2. Fig 1: Measuring D Height
    GM0000093Courtesy of GENERAL MOTORS CORP.
  2. Measure between the axle bracket and jounce bumper mount bracket as shown in graphic.
  3. Repeat step 1 and re-measure the distance.
  4. The true D height is the average of the measurement from step 1 and step 2. The side to side difference in D height must not exceed 14 mm (0.55 in).
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