GM Astro/Safari 1985-1996 Repair Guide

Upper Control Arm

Print

REMOVAL & INSTALLATION



See Figure 1



Click image to see an enlarged view

Fig. Fig. 1: Exploded view of the upper control arm and bushing mounting-1990-96 vehicles

This procedure requires the use of a ball joint separator tool and NEW upper control arm retaining nuts.

  1. Disconnect the negative battery cable for safety.
  2.  
  3. Raise the vehicle and support with jackstands.
  4.  
  5. Remove the front wheels.
  6.  
  7. If necessary, remove the air cleaner extension.
  8.  
  9. Remove the brake hose from the control arm and tie out of the way.
  10.  
  11. Remove the upper ball joint cotter pin and nut.
  12.  
  13. Disconnect the control arm from the knuckle using a ball joint separator.
  14.  
  15. For 1990-91 vehicles, remove the control arm nuts, bolts and washers.
  16.  
  17. For 1992-96 vehicles, remove the control arm cam hardware (nuts, cams and bolts).
  18.  
  19. Remove the control arm from the vehicle. If replacement is necessary, remove the bushings.
  20.  

To install:
  1. If removed, install the new bushings.
  2.  
  3. Install the upper control arm to the frame.
  4.  
  5. Install the upper control arm mounting hardware (bolts and cams or washers, as applicable, along with the NEW nuts). Make sure the bolt threads are opposed inside the bracket. On 1992-96 vehicles, make sure the cam lobes are pointing downward.
  6.  

The control arm retainers MUST be tightened with the vehicle suspension at normal ride height. This can either be accomplished by starting the nuts now, then installing the remaining components along with the wheels and lowering the vehicle, or by moving jackstands under the ends of the lower control arms and resting the vehicle on them. If the latter solution is tried, make sure the the FULL WEIGHT of the vehicle front end is on the suspension.

  1. Tighten the control arm nuts to 88 ft. lbs. (120 Nm) for 1990-92 vehicles, to 105 ft. lbs. (145 Nm) for 1993-95 vehicles or to 91 ft. lbs. (123 Nm) for 1996 vehicles, all with the suspension at normal ride height and compression.
  2.  

When tightening the control arm nuts, start with the FRONT NUT FIRST.

  1. Install the upper ball joint to the steering knuckle then secure using the nut. Tighten the nut to 95 ft. lbs. (128 Nm) for 1990-95 vehicles or to 66 ft. lbs. (90 Nm) for 1996 vehicles.
  2.  

The upper ball joint retaining nut MUST be tightened with the vehicle suspension at normal ride height. This can either be accomplished by installing the wheels and lowering the vehicle, or by moving jackstands under the ends of the lower control arms and resting the vehicle on them. If the latter solution is tried, make sure the the FULL WEIGHT of the vehicle front end is on the suspension.

  1. Install a new cotter pin to the castellated nut. Tighten the nut (but no more than an additional 1 / 6 turn) in order to align the cotter pin. DO NOT loosen the nut from the specified torque.
  2.  
  3. Connect the brake hose and bracket to the control arm.
  4.  
  5. If removed, install the air cleaner extension.
  6.  
  7. If not done already, install the tire and wheel assembly, then remove the jackstands and carefully lower the vehicle.
  8.  
  9. Connect the negative battery cable.
  10.  

 
label.common.footer.alt.autozoneLogo