GM Full-Size Trucks 1988-1998 Repair Information

Upper Control Arm and Bushings

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REMOVAL & INSTALLATION



See Figure 1

  1. Raise and support the truck on jackstands.
  2.  



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Fig. Fig. 1: Installing the upper control arm-K-Series

  1. Support the lower control arm with a floor jack.
  2.  
  3. Remove the wheel.
  4.  
  5. Unbolt the brake hose bracket from the control arm.
  6.  
  7. Remove the air cleaner extension (if necessary).
  8.  
  9. Unfasten the brake hose bracket retainer and wire the hose aside.
  10.  
  11. Remove the cotter pin from the upper control arm ball stud and loosen the stud nut until the bottom surface of the nut is slightly below the end of the stud.
  12.  
  13. Using a screw-type forcing tool, break loose the ball joint from the knuckle.
  14.  
  15. Remove the nuts and bolts securing the control arm to the frame brackets.
  16.  
  17. Tape the shims and spacers together and tag for proper reassembly.
  18.  

To install:
  1. Installation is the reverse of removal but please note the following important steps.
  2.  
  3. Place the control arm in position and install the shims, bolts and new nuts. Both bolt heads must be inboard of the control arm brackets. Tighten the nuts finger tight for now.
  4.  

Do not tighten the bolts yet. The bolts must be torqued with the truck at its proper ride height.

  1. Install the ball stud nut. Tighten the nut to 94 ft. lbs. (128 Nm) on 1988-90 models and 1995-98 models and 84 ft. lbs. (115 Nm) on 1991-94 models. Install the cotter pin. Never back off the nut to install the cotter pin. Always advance it. Never advance it more than 1 / 6 turn.
  2.  
  3. Lower the truck. Once the weight of the truck is on the wheels perform the Z height adjustment procedure in this section.
  4.  
  5. When the adjustment is correct, tighten the control arm pivot nuts to 88 ft. lbs. (120 Nm) on 1988-90 models; 140 ft. lbs. (190 Nm) on 1991-98 models. If the adjustment is not correct, tighten the pivot bolts to specification and have the alignment checked.
  6.  

 
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