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

Lower Control Arm

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The lower control arm is a two-piece welded unit with a riveted ball joint. A conventional rubber bushing is used for the rear lower control arm pivot. The front lower control arm bushing is mounted vertically.

REMOVAL AND INSTALLATION



Some special tools are required to perform this operation including, a front hub spindle removal tool and a suitable ball joint separator tool.


WARNING
Do not hammer or pry ball joint from knuckle. Failure to use recommended tools may cause damage to the ball joint and seal.

See Figure 1



Click image to see an enlarged view

Fig. Fig. 1: Exploded view of the control arm-to-frame mounting

  1. Raise the vehicle and suitably support by the frame allowing the control arms to hang free.
  2.  
  3. Remove the wheel and tire assembly.
  4.  
  5. Remove the steering gear outer tie rod from the steering knuckle.
  6.  
  7. Remove the stabilizer shaft link from the control arm.
  8.  
  9. Remove the front drive axle shaft nut and washer.
  10.  
  11. Use a suitable front hub spindle removal tool to Push the axle splines back out of the front wheel drive shaft bearing.
  12.  
  13. Remove the drive axle from the transaxle.
  14.  

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. If equipped, remove the ABS wheel speed sensor jumper harness.
  4.  
  5. Remove and discard the cotter pin, then loosen the nut from the ball stud.
  6.  
  7. Remove the pinch bolt and the control arm mounting bolts, then remove the control arm from the vehicle.
  8.  

To install:
  1. If equipped, install the ABS wheel speed sensor jumper harness, if equipped.
  2.  
  3. Install the control arm to the frame and install the mounting bolts but do not tighten at this time.
  4.  
  5. Install the drive axle into the transaxle and the front drive axle shaft splines into the front wheel drive shaft bearing, Tighten the axle nut to 96 lb. ft. (130 Nm).
  6.  
  7. Install the ball joint to the steering knuckle using a NEW pinch bolt and nut, then tighten to 33 ft. lbs. (45 Nm). Install a new cotter pin.
  8.  
  9. Raise the vehicle slightly so the weight of the vehicle is supported by the control arms.
  10.  

The weight of the vehicle must be supported by the control arms when tightening the control arm mounting bolts.

  1. Tighten the stabilizer shaft bushing clamp nuts to 32 ft. lbs. (43 Nm) and the control arm pivot bolt nut to 61 ft. lbs. (83 Nm).
  2.  
  3. Remove the seal protectors.
  4.  
  5. Install the tire and wheel assembly.
  6.  
  7. Raise the vehicle slightly to allow removal of the jackstands and lower the vehicle.
  8.  

 
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