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Home >> Chevrolet >> 2018 >> Spark LT, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 90 (Suspension System General Diagnosis) >> Diagnostic Information and Procedures >> Trim Height Inspection >> Measuring the D Dimension >> Measurement Definitions

Measurement Definitions

WARNING: This page is about a different car, the 2017 Chevrolet Spark. However, it is still accessible from the selected car via links, so may be relevant.

The D Height: The vertical distance from the center of rear shock absorber lower bolt (1) to the center of the rear axle trailing arm bolt (2).

The D Height dimension measurement determines the proper rear end ride height. There is no adjustment procedure. Repair may require replacement of suspension parts.

Use the following procedures to measure the D dimensions:

  1. With the vehicle on a flat surface, lift upward on the rear bumper 38 mm (1.59 in).
  2. Gently remove your hands and allow the vehicle to settle.
  3. Repeat the jouncing operation a total of 2 times.
  4. Measure the vertical distance from the center of rear shock absorber lower bolt to the center of the rear axle trailing arm bolt.
  5. Repeat this task for the other side of the vehicle.
  6. Using your hands, jounce the front of the vehicle downward approximately 38 mm (1.59 in).
  7. Gently remove your hands and allow the vehicle to settle.
  8. Repeat the jouncing operation a total of 2 times.
  9. Measure the D height dimension.
  10. The true D height dimension number is the average of the high and the low measurements. Refer to Trim Height Specifications .
  11. If these measurements are out of specifications, inspect for the following conditions:
    • Worn or damaged suspension components
    • Collision damage