GM Lumina/Silhouette/Transport APVs 1990-1999 Repair Guide

Lower Ball Joint

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INSPECTION



Front lower control arm ball stud tightness in the knuckle boss should be checked when inspecting the front lower control arm ball stud (ball joint). Raise the vehicle, allowing the front suspension to hang free. Grasp the tire at the top and bottom and move the bottom of the tire in an in-and-out motion while checking for movement of the stud end or castellated nut at the knuckle boss. Observe any horizontal movement of the knuckle relative to the control arm. Ball joints/studs must be replaced if any looseness is detected in the joint, or the ball joint seal is cut. Worn or damaged parts must be replaced with the correct service parts. Failure to use the correct front lower control arm ball stud and specified fastener torque may eventually cause a loose joint and may result in loss of steering control which could result in personal injury.

Removal & Installation

  1. Raise and safely support the vehicle.
  2.  
  3. Place jackstands under the frame.
  4.  
  5. Lower the vehicle slightly so the weight of the vehicle rests on the jackstands and not on the control arms.
  6.  
  7. Remove the wheel and tire assembly.
  8.  


WARNING
Drive axle joint seal protectors should be used anytime service is performed on or near the drive axles. Failure to observe this could result in joint or seal failure.

  1. Place a modified inner drive joint seal protector on the drive axle joints.
  2.  
  3. Remove the pinch bolt from the vehicle.
  4.  
  5. Remove the rag joint from the steering knuckle.
  6.  
  7. Use a 1 /8in. (3mm) drill bit to make a pilot hole through the rivets, then finish drilling the rivets out with a 1 / 2 in. (13 mm) drill bit.
  8.  


WARNING
Be careful not to damage the drive axle seals when drilling out the ball joint rivets.

  1. Loosen the stabilizer shaft bushing assembly nut.
  2.  
  3. Remove the ball joint from the steering knuckle and control arm.
  4.  

See Figure 1

Click image to see an enlarged view

Fig. Fig. 1: Removing the ball joint from the steering knuckle.

To install:
  1. Position the ball joint in the control arm.
  2.  
  3. Install the three ball joint bolts and nuts and tighten to specification as specified in the ball joint kit.
  4.  
  5. Install the ball joint to the knuckle, install a new pinch bolt and nut, and tighten to 33 ft. lbs. (45 Nm).
  6.  
  7. Install the stabilizer shaft bushing clamp bolts to 33 ft. lbs. (45 Nm).
  8.  
  9. Remove the seal protectors.
  10.  
  11. Install the tire and wheel assembly.
  12.  
  13. Raise the vehicle slightly to allow removal of the jackstands, then carefully lower the vehicle.
  14.