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Front Axle Height Measurement

The C height dimension measurement determines the proper ride height for the front end of the vehicle. Vehicles without torsion bars have no adjustment and could require replacement of suspension components. The B height dimension measurement determines if the front axle is bent. Check the suspension and steering components for any binding conditions.

Fig 1: Front Axle Height Measurement
G01585856Courtesy of GENERAL MOTORS CORP.
  1. Lift the front bumper of the vehicle up about 38 mm (1.5 in).
  2. Gently remove your hands.
  3. Allow the vehicle to settle into position.
  4. Repeat this jouncing operation 2 more times for a total of 3 times.
  5. Measure from the center line to the bottom inside frame rail in order to obtain the C height measurement for the axle.
  6. Measure from the axle center line of each front wheel to the bottom of the axle beam to obtain the B height measurement for the front axle.
  7. The true C and B height dimension is the average of the high and low measurements. Refer to Trim Height Specifications  .