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  1. Measure frame angle, in relation to level, directly behind cab. Using suitable alignment equipment, determine existing caster. Combine frame angle with caster angle to determine corrected caster angle as follows:
    • If frame is down in rear, frame angle must be subtracted from positive caster angle.
    • If frame is down in rear, frame angle must be added to negative caster angle.
  2. Measure distance from top of jounce bumper bracket on lower control arm to bottom of frame crossmember. Determine correct caster angle for measured clearance and adjust.
  3. To increase caster, add shims between forward upper control arm attaching bolt and frame, or subtract shims from rear attaching bolt. To decrease caster, subtract shims from forward bolt, or add shims to rear bolt.
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