Rear Single Axle Height Measurement

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

Fig 1: Rear Single Axle Height Measurement

Courtesy of GENERAL MOTORS CORP.

1. Make sure the vehicle is on a flat level surface.
2. Measure the C height by measuring the distance between the rear axle center line to bottom inside of frame rail.
3. Check the suspension components for any binding conditions. Allow the vehicle to settle into position.
4. Measure the C height dimension.
5. The true C height dimension number is the average of the high and the low measurements.
6. If these measurements are out of specifications, inspect for the following conditions:
   • Sagging front suspension-Refer to LEAF SPRINGS REPLACEMENT in Front Suspension.
   • Sagging rear leaf springs-Refer to LEAF SPRING REPLACEMENT in Rear Suspension.
   • Worn rear suspension components, such as leaf spring bushings-Refer to SPRING BUSHING REPLACEMENT in Rear Suspension.
   • Improper tire inflation.
   • Improper weight distribution
   • Collision damage