S10 Pickup, Sonoma 2000-2004

4-Wheel Drive Torsion Bar Front Suspension

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Lower Control Arm



Removal & Installation

NOTE
Tools Needed: universal tie rod separator J-24319-01, torsion bar unloader J-36202, lower control arm bushing service kit J-36618 (if the control arm bushing are being replaced) and ball joint C-clamp J-9519-23. Whether or not the control arm or bushing are being replaced, NEW control arm retaining nut should be used once the old ones have been loosened and removed.

  1. Raise and support the vehicle.
  2.  
  3. Remove the tire and wheel.
  4.  
  5. Remove the torsion bar from the lower control arm.
  6.  
  7. Remove the steering linkage shield.
  8.  
  9. Remove the stabilizer shaft link from the lower control arm.
  10.  
  11. Remove the stabilizer shaft bracket bolts.
  12.  
  13. Lower the stabilizer shaft.
  14.  
  15. Remove the shock absorber lower mounting bolt.
  16.  
  17. Compress the shock absorber.
  18.  
  19. Remove the steering knuckle.
  20.  
  21. Remove the lower control arm to the crossmember and the frame bracket mounting nuts and bolts.
  22.  
  23. Remove the lower control arm from the frame.

    Click image to see an enlarged view

    Fig. Lower control arm mounting-4WD models

  24.  

To install:

  1. Install the front leg of the lower control arm into the crossmember before installing the rear leg into the frame bracket.
  2.  
  3. Install the lower control arm mounting bolts in the direction shown.
  4.  
  5. Tighten the nuts with the lower control arm at the proper trim height. Tighten the nuts and the bolts with the front suspension loaded.
  6.  
  7. Install the lower control arm mounting nuts and tighten to 81 ft. lbs. (110 Nm).
  8.  
  9. Install the steering knuckle.
  10.  
  11. Install the shock absorber lower mounting bolt and tighten to 54 ft. lbs. (73 Nm).
  12.  
  13. Raise the stabilizer shaft, install the stabilizer shaft bracket bolts and tighten to 48 ft. lbs. (65 Nm).
  14.  
  15. Install the stabilizer shaft link to the lower control arm.
  16.  
  17. Install the steering linkage shield.
  18.  
  19. Install the torsion bar.
  20.  
  21. Install the tire and wheel.
  22.  
  23. Lower the vehicle.
  24.  
  25. Check the front wheel alignment.
  26.  

Upper Control Arm



Removal & Installation
  1. Remove or disconnect the following:
    NOTE
    The 4WD vehicles do not use shims to adjust the front wheel alignment. Instead, the upper control arm bolts are equipped with cams, which are rotated to achieve caster and camber adjustments. In order to preserve adjustment and ease installation, matchmark the cams to the control arm before removal. If the control arm is being replaced, transfer the alignment marks to the new component before installation.



    Tire and wheel assembly
     
    Support the lower control arm with a jack stand
     
    Unload the torsion bar
     
    Cotter pin from the ball joint, then loosen the retaining nut
     
    Steering knuckle from the upper ball joint. Be sure to support the steering knuckle/hub assembly to prevent damaging the brake hose.
     



    Front and rear nuts retaining the control arm retaining bolts to the frame
     
    Outer cams from the bolts
     
    Bolts and inner cams
     
    Control arm from the vehicle
     
    Retaining nut and the bumper from the control arm, if necessary
     

  2.  
  3. If the bushings are being replaced, use a suitable bushing service set to remove the bushings from the arm.
  4.  

To install:

  1. Install or connect the following:

    Bushing service set to drive the new bushings into the control arm, if removed
     
    Bumper and retaining nut to the control arm, if removed. Tighten the bumper retaining nut to 20 ft. lbs. (27 Nm).
     
    Control arm, retaining bolts (from the inside of the frame brackets facing outward) and the inner cams. The inner cams must be positioned on the bolts before they are inserted through the control arm and frame brackets.
     
    Outer cams over the retaining bolts, then the nuts to the ends of the bolts at the front and rear of the control arm
     

  2.  
  3. Align the cams to the reference marks made earlier, then tighten the end nuts to 85 ft. lbs. (115 Nm).

    Ball joint to the knuckle
     
    Load the torsion bar
     
    Tire and wheel assembly
     

  4.  
  5. Check and adjust the front end alignment, as necessary.
  6.  

 
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