GM Service Manual Online
For 1990-2009 cars only
  1. Inspect the ball stud tightness in the steering knuckle boss.
  2. 1.1. Shake the wheel and feel for movement of the stud end or the castellated nut at the knuckle boss.
    1.2. Inspect the castellated nut fastener tightening specifications is an alternative method of inspecting for wear. A loose nut can indicate a bent stud or an opened-up hole in the knuckle boss.
  3. Replace worn or damaged the ball joints and knuckles.