Measuring the P & R Dimension

Fig 1: Checking P & R Dimensions

Courtesy of GENERAL MOTORS CORP.

Use the following procedure to check the P and R dimensions:

1. Use your hands to lift the front bumper approximately 38 mm (1.59 in).
2. Remove your hands and allow the vehicle to lower.
3. Use your hands to jounce the front of the vehicle downward approximately 38 mm (1.59 in).
4. Remove your hands and allow the vehicle to rise.
5. The dimension P for the left and right side of the vehicle is measured from the bottom lip of the wheel opening to the ground measured at the center line of the front wheel.
6. Compare the measurement to the specification table. Refer to Trim Height Specifications .
7. If the measurement is outside of the specified range, replace the front springs. Refer to Shock, Shock Component, and/or Spring Replacement .
8. Use your hands to lift the rear bumper approximately 38 mm (1.59 in).
9. Remove your hands and allow the vehicle to lower.
10. Use your hands to jounce the rear of the vehicle downward approximately 38 mm (1.59 in).
11. The dimension R for the left and right side of the vehicle is measured from the bottom lip of the wheel opening to the ground measured at the center line of the rear wheel.
12. Compare the measurement to the specification table. Refer to Trim Height Specifications .
13. If the measurement is outside of the specified range, replace the rear springs. Refer to Shock, Shock Component, and/or Spring Replacement .