GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2009 🢒 Savana 🢒 Suspension 🢒 Wheel Alignment 🢒 Front Caster and Camber Adjustment

    Object Number: 856825 Size: SH

    Note: Caster measurements or values must be compensated for the measured frame angle.

  1. Caster is relative to frame, the caster values must be compensated for the measured frame angle. Determine the frame angle by positioning a digital protractor or equivalent between the transmission support (2) and the #3 body mount (3) and obtaining a frame angle measurement.

    2. Object Number: 851500 Size: SH
  2. Frame angle is positive when higher in the rear. Measure both sides of the frame and take an average from those measurements. Then add the average frame angle to the caster reading when making adjustments.

    3. Object Number: 851499 Size: SH
  3. Frame angle is negative when lower in the rear. Measure both sides of the frame and take an average from the measurements. Then subtract the average frame angle from the caster reading when making adjustments.

    4. Object Number: 821576 Size: SH
  4. The caster and camber adjustments are made by rotating the offset cam bolt and the cam in the slotted frame bracket in order to reposition the control arm.

    5. Note: Before adjusting the caster and camber angles, jounce the front bumper three times to allow the vehicle to return to normal height.

    Measure and adjust the caster and the camber with the vehicle at curb height. The front suspension Z dimension is indicated in Trim Heights. Refer to Trim Height Inspection.

  5. For an accurate reading, do not push or pull on the tires during the alignment process.
  6. Determine the caster angle (2).

    7. Object Number: 365809 Size: SH
  7. Determine the positive camber (2) or negative camber (3) angle.

    8. Object Number: 870459 Size: SH
  8. Remove the pinned adjusting cam insert. Do not reinstall the cam insert.

    9. Caution: Refer to Fastener Caution in the Preface section.

  9. Loosen the upper control arm cam adjustment bolts.
  10. Adjust the caster and the camber angle by turning the cam bolts until the specifications have been met.

    11. When the adjustments are complete, hold the cam bolt head in order to ensure the cam bolt position does not change while tightening the nut to 175 N·m (129 lb ft).

  11. Verify that the caster and the camber are still within specifications. Refer to Wheel Alignment Specifications.

    12. When the caster and camber are within specifications, adjust the toe. Refer to Front Toe Adjustment.