GM S10/S15/Sonoma Pick-Ups 1982-1993 Repair Manual

Torsion Bar

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Instead of the coil spring used on the front suspension of 2wd trucks, the 4wd vehicles covered by this manual are equipped with a torsion bar.

REMOVAL & INSTALLATION



See Figures 1, 2 and 3

The following procedure requires the use of the torsion bar unloader tool No. J-22517-C (early model vehicles), J-36202 (late model vehicles), or equivalent.

  1. Raise and support the front of the vehicle safely using jackstands.
  2.  
  3. Install a torsion bar unloader tool to relax the tension on the torsion bar adjusting arm screw; record the number of turns necessary to properly install the tool. Remove the adjusting screw.
  4.  



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Fig. Fig. 1: Torsion bar front mounting-4wd front suspension



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Fig. Fig. 2: Use the torsion bar unloader to ease tension so the adjuster bolt may be removed

  1. For vehicles through 1991:
    1. Remove the torsion support-to-insulator nut/bolt, the support insulator-to-frame nuts/bolts, the insulator retainer and the insulator from the support.
    2.  
    3. Slide the torsion bar(s) forward into the control arm(s) to clear the support.
    4.  
    5. Remove the adjusting arm, the adjusting arm screw and the nut from the support.
    6.  
    7. Remove the torsion bar from the control arm and the support.
    8.  

  2.  
  3. For 1992-93 vehicles:
    1. Remove the adjuster arms.
    2.  
    3. Remove the nut and square washer (raise the support out of the way) from the retainer, then remove the retainer bolts from underneath the frame.
    4.  
    5. Slide the insulator off the support and remove it from the vehicle.
    6.  
    7. Disconnect the muffler flange from the converter, loosen the rear exhaust hanger and lower the rear exhaust.
    8.  
    9. Remove the torsion support from the frame.
    10.  
    11. Remove the torsion bars from the lower control arms.
    12.  

  4.  

To install:


Click image to see an enlarged view

Fig. Fig. 3: Torsion bar and support mounting/alignment-1992-93 vehicles

  1. For 1992-93 vehicles:
    1. Position the torsion bars with the lower control arms. If installing a replacement component, be sure the tag is facing forward.
    2.  
    3. Install the support.
    4.  
    5. Install and secure the rear exhaust system to the proper height, then connect the muffler flange to the converter.
    6.  
    7. Install the insulator, making sure the mount studs are positioned through the support and the insulator locator tabs are indexed to the support (facing forward).
    8.  
    9. Install and finger-tighten the square washer and nut.
    10.  
    11. Install the insulator mounting retainers, then tighten the bolts to 26 ft. lbs. (35 Nm) and/or the nuts to 25 ft. lbs. (34 Nm).
    12.  
    13. Install the adjuster arms, then connect the torsion bars to the arms. With the torsion bars installed, check for an assembled clearance from the end of the bar to the support of 0.236 in. (6.0mm).
    14.  
    15. Lubricate the top of the adjusting arm and the adjusting bolt, then install the nuts and adjuster bolts.
    16.  

  2.  
  3. For vehicles through 1991:
    1. Lubricate the top of the adjusting arm, then install the arm to the support.
    2.  
    3. Install the adjusting bolt nut to the support, then lubricate the adjusting bolt and loosely install it to the retaining nut.
    4.  
    5. Install the insulator to the support end, then install the support to the frame.
    6.  
    7. Install the nut to the retainer and the retainer to the support, then secure the bolts to the retainer from underneath the frame.
    8.  
    9. Install the retainer nuts to the bolts from above the retainer, then install the top center retainer bolt. Tighten the retainer nuts (or bolts from below the frame) to 26 ft. lbs. (35 Nm) and the center retainer bolt to 25 ft. lbs. (35 Nm).
    10.  
    11. Slide the torsion bar into the lower control arm.
    12.  
    13. Raise and slide the torsion bar into the adjusting arm making sure the torsion bar clearance at the support is 0.236 in. (6mm).
    14.  

  4.  
  5. Attach the torsion bar unloader tool using the same number of turns as recorded during removal, then thread the adjusting screw in until contact is just made with the adjusting arm.
  6.  
  7. Remove the torsion bar unloader tool.
  8.  
  9. Remove the jackstands and carefully lower the vehicle.
  10.  
  11. Check and adjust the trim height ("Z'' adjustment), as necessary. For details, please refer to the front end alignment procedures found later in this section.
  12.  

 
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