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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1038 (Suspension System General Diagnosis) >> Diagnostic Information and Procedures >> Trim Height Inspection Procedure >> D Height Measurement

D Height Measurement

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IMPORTANT: There are no specified trim heights specifications on leaf spring vehicles because it is not an adjustable feature. The height of the suspension will depend on the option content of the vehicle as well as the aftermarket equipment that is placed on the vehicle. The measurements are used for comparison only and should be within 15 mm with the vehicle at curb and no accessories.
  1. With the vehicle on a flat surface, lift upward on the rear bumper 38 mm (1.5 in).
  2. Allow the vehicle to settle into position.
    3. IMPORTANT: Measure the metal to metal contact points of the rear axle to the frame on the inboard side of the leaf springs.
    Fig 1: Measuring Rear D Height
    GM0000093Courtesy of GENERAL MOTORS CORP.
  3. Measure the D height by measuring the distance between the bumper bracket and the top of the rear axle tube.
  4. Repeat the jouncing operation 2 more times for a total of 3 times.
  5. Use the highest and lowest measurements to calculate the average height.
  6. The true D height dimension number is the average of the highest and the lowest measurements.
  7. If these measurements are out of specifications, inspect for the following conditions:
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