Front Caster and Camber Adjustment

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.

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

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.
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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.
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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.
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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.

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 .

For an accurate reading, do not push or pull on the tires during the alignment process.
Determine the caster angle (2).
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Determine the positive camber (2) or negative camber (3) angle.
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Remove the pinned adjusting cam insert. Do not reinstall the cam insert.
Loosen the upper control arm cam adjustment bolts.
CAUTION:
Refer to Fastener Caution .
Adjust the caster and the camber angle by turning the cam bolts until the specifications have been met.
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).
Verify that the caster and the camber are still within specifications. Refer to Wheel Alignment Specifications .
When the caster and camber are within specifications, adjust the toe. Refer to Wheel Alignment - Steering Wheel Angle and/or Front Toe Adjustment .