GM Full-Size Trucks 1988-1998 Repair Information

Lower Control Arm and Bushing-C-Series

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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 lower control arm-C-Series

  1. Remove the coil spring.
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  3. Support the inboard end of the control arm after spring removal.
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  5. Remove the cotter pin from the lower ball stud and loosen the nut.
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  7. Loosen the lower ball stud in the steering knuckle using a ball joint stud removal tool. When the stud is loose, remove the nut from the stud. It may be necessary to remove the brake caliper and wire it to the frame to gain clearance.
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  9. Remove the lower control arm.
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To install:
  1. Slowly raise the jack and lower the control arm. Guide the control arm into place with a prybar.
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  3. Install the pivot shaft bolts, front one first. The bolts must be installed with the heads towards the front of the truck! Remove the safety chain or spring compressors.
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Do not tighten the bolts yet. The bolts must be torqued with the truck at its proper ride height.

  1. Remove the jack.
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  3. Connect the stabilizer bar to the lower control arm.
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  5. Install the shock absorber.
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  7. Install the wheel.
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  9. Lower the truck. Once the weight of the truck is on the wheels:
    1. Lift the front bumper about 38mm and let it drop.
    2.  
    3. Repeat this procedure 2 or 3 more times.
    4.  
    5. Draw a line on the side of the lower control arm from the centerline of the control arm pivot shaft, dead level to the outer end of the control arm.
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    7. Measure the distance between the lowest corner of the steering knuckle and the line on the control arm. Record the figure.
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    9. Push down about 38mm on the front bumper and let it return. Repeat the procedure 2 or 3 more times.
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    11. Re-measure the distance at the control arm.
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    13. Determine the average of the 2 measurements. The average distance should be 95.0mm plus or minus 6mm.
    14.  
    15. If the figure is correct, tighten the control arm pivot nuts to 96 ft. lbs. (130 Nm) on 1988-90 models; 121 ft. lbs. (165 Nm) on 1991-94 models; 137 ft. lbs. (101 Nm) on 1995-98 models.
    16.  
    17. If the figure is not correct, tighten the pivot bolts to 96 ft. lbs. (130 Nm) on 1988-90 models; 121 ft. lbs. (165 Nm) on 1991-95 models and 101 ft. lbs. (137 Nm) on 1996-98 models. Have the front end alignment corrected.
    18.  

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