GM Full-Size Trucks 1988-1998 Repair Information

Steering Knuckle and Seal

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REMOVAL & INSTALLATION



See Figures 1 and 2

  1. Raise and support the front end on jackstands.
  2.  



Click image to see an enlarged view

Fig. Fig. 1: Removing the brake disc-K-Series

  1. Remove the wheel.
  2.  
  3. Remove the caliper and suspend it out of the way.
  4.  
  5. Remove the brake disc.
  6.  
  7. If necessary, remove the left stabilizer bar clamp.
  8.  
  9. If necessary, remove the left stabilizer bar bolt, spacer and bushings at the lower control arm.
  10.  
  11. Disconnect the tie rod end from the knuckle or steering relay rod.
  12.  
  13. Remove the hub nut and washer.
  14.  
  15. Using a puller, force the outer end of the drive axle out of the hub. Remove the hub/bearing assembly.
  16.  
  17. Remove the drive axle.
  18.  
  19. Support the lower control arm with a floor jack.
  20.  
  21. Unbolt and remove the splash shield.
  22.  
  23. Remove the upper and lower ball joint nuts and cotter pins. Using a screw-type forcing tool, separate the upper, then the lower, ball joint from the knuckle.
  24.  
  25. Remove the knuckle and old seal.
  26.  

To install:
  1. Installation is the reverse of removal, but please note the following important steps.
  2.  
  3. Drive a new seal into the knuckle using installer tool J-36605 or its equivalent.
  4.  
  5. Attach the ball joints to the knuckle and tighten to specifications.
  6.  
  7. Tighten the splash shield bolts to 12 ft. lbs. (16 Nm) on 1988-90 models; 19 ft. lbs. (26 Nm) on 1991-98 models.
  8.  
  9. Position the axle shaft and install the flange bolts. Tighten them to 59 ft. lbs. (79 Nm).
  10.  



Click image to see an enlarged view

Fig. Fig. 2: Exploded view of the hub, knuckle and bearing-K-Series

ADJUSTMENT



Z Height
  1. Lower the truck. Once the weight of the truck is on the wheels perform the following height adjustment procedure.
  2.  
  3. Lift the front bumper about 38mm and let it drop.
  4.  
  5. Repeat this procedure 2 or 3 more times.
  6.  
  7. 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.
  8.  
  9. Measure the distance between the lowest corner of the steering knuckle and the line on the control arm. Record the figure.
  10.  
  11. Push down about 38mm on the front bumper and let it return. Repeat the procedure 2 or 3 more times.
  12.  
  13. Re-measure the distance at the control arm.
  14.  
  15. Determine the average of the 2 measurements. The average distance should be:

    K15/25 without F60 option: 151-163mm
     
    K15/25 with F60 option: 177-190mm
     
    K35 without F60 option: 139-151mm
     
    K35 with F60 option: 167-179mm
     

  16.  
  17. When the adjustment is correct, tighten the control arm pivot nuts to specification. If the adjustment is not correct, tighten the pivot bolts to specification and have the alignment checked.
  18.  

 
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