Sierra, Silverado 2006-2007

Shock Absorbers

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Removal & Installation



2005-06 & 2007 Classic Models
2-Wheel Drive
  1. Raise and support the vehicle.

    Click image to see an enlarged view

    Fig. RTD connector

  2.  
  3. If equipped with selectable ride, disconnect the Real Time Damping (RTD) link rod from the sensor. Grasp the connector lock tabs. Rotate the connector lock tabs (1) and (2) counter-clockwise until the connector is unlocked. Disengage the connector from the tennon by firmly pulling the connector up. Hold the tennon end with a wrench while removing the nut. Remove the nut.

    Click image to see an enlarged view

    Fig. Upper shock insulator

  4.  
  5. Remove the upper insulator. Do not discard the plastic pilot ring.

    Click image to see an enlarged view

    Fig. Shock absorber removal



    Click image to see an enlarged view

    Fig. Shock absorber removal

  6.  
  7. Remove the shock absorber mounting bolts at the lower control arm. Remove the shock absorber through the lower control arm from below.
  8.  

To install:

  1. Support the lower control arm with a suitable jack in order to align the tennon with the mounting hole if equipped with selectable ride.
  2.  
  3. Install or connect the following:

    Shock absorber through the lower control arm from below
     
    Tennon through the mounting hole in the upper spring pocket
     

  4.  
  5. Align the shock absorber with the mounting holes in the lower control arm.
    NOTE
    The upper insulators are substantially larger that the lower insulators. The upper insulator must be installed above the shock mounting bracket on the frame. The plastic pilot ring will assist the alignment of the isolators.



    Shock absorber mounting bolts to the lower control arm. Tighten to 18 ft. lbs. (25 Nm).
     



    Upper insulator to the shock absorber
     
    Nut to the tennon end. Do not tighten the nut.
     
    RTD link rod to the sensor (if equipped).
     

  6.  
  7. Remove the safety stands.
  8.  
  9. Lower the vehicle. Hold the tennon end with a wrench while torquing the nut. Tighten the nut to 15 ft. lbs. (20 Nm).
  10.  
  11. Connect the electrical connector using the following procedure:
    1. Verify that the connector is unlocked.
    2.  
    3. Align the connector so that the tabs are perpendicular to the wrench flats on the tennon end.
    4.  
    5. Engage the connector to the tennon by firmly pushing the connector down.
    6.  
    7. Grasp the connector lock tabs. Rotate the connector counter clockwise.
    8.  

  12.  
  13. The connector is locked into place when you hear an audible snap and the tabs are aligned.
  14.  

4-Wheel Drive
  1. Raise and support the vehicle.
  2.  
  3. Remove or disconnect the following:
    NOTE
    The lower shock mounting bushing is serviceable by driving the bushing out with the appropriate tool.



    Real Time Damping (RTD) link rod from the sensor, if equipped
     
    Electrical connector, if equipped with selectable ride. Grasp the connector lock tabs. Rotate the connector tabs counter clockwise until the connector is unlocked. Disengage the connector from the tennon by firmly pulling the connector up. Hold the tennon end with a wrench while removing the nut. Remove the nut.
     
    Upper insulator. Do not discard the plastic pilot ring.
     
    Shock absorber mounting bolt at the lower control arm
     



    Shock absorber
     

  4.  

To install:

  1. Install the shock absorber. Insert the stem through the hole in the shock bracket on the frame. Align the shock absorber with the mounting holes in the lower control arm.
  2.  
  3. Install or connect the following:
    NOTE
    The upper insulators are substantially larger that the lower insulators. The upper insulator must be installed above the shock mounting bracket on the frame. The plastic pilot ring will assist the alignment of the isolators.



    Shock absorber through bolt to the lower control arm
     
    Shock absorber through bolt nut and tighten to 59 ft. lbs. (80 Nm)
     



    Upper insulator to the shock absorber
     
    Nut to the tennon end. Do not tighten the nut
     
    RTD link rod to the sensor, if equipped
     

  4.  
  5. Remove the safety stands. Lower the vehicle. Hold the tennon end with a wrench while torquing the nut. Tighten the nut to 15 ft. lbs. (20 Nm).
  6.  
  7. Connect the electrical connector using the following procedure if equipped with selectable ride.
    1. Verify that the connector is unlocked.
    2.  
    3. Align the connector so that the tabs (1) are perpendicular to the wrench flats on the tennon end.
    4.  
    5. Engage the connector to the tennon by firmly pushing the connector down.
    6.  
    7. Grasp the connector lock tabs (1, 2). Rotate the connector counter clockwise. The connector is locked into place when you hear an audible snap and the tabs are aligned.
    8.  

  8.  

Except Classic
  1. Raise and support the vehicle.
  2.  
  3. Remove or disconnect the following:

    Front wheels
     
    Outer tie rod from the steering knuckle
     
    Lower shock mounting bolts
     
    Electronic suspension control electrical connector
     

  4.  
  5. Support the lower arm, then remove the 3 upper shock mounting nuts and remove the assembly from the vehicle.
  6.  
  7. Compress the coil spring using tool J45400 or equivalent.
  8.  
  9. Make sure one of the mount studs is aligned with the centerline of the shock absorber dog bone.
  10.  
  11. Use a wrench to prevent the shock rod from rotating, then remove the upper shock mount nut.
    NOTE
    When disassembling the shock absorber assembly, do not let the shock rod rotate. It may damage the shock.

  12.  
  13. Separate the assembly and replace any components necessary.

    Click image to see an enlarged view

    Fig. Shock module assembly mounting



    Click image to see an enlarged view

    Fig. Exploded view of the shock module assembly-(1) Upper nut, (2) suspension mount, (3) upper seat, (4) suspension bumper, (5) upper insulator, (6) coil spring, (7) lower insulator, (8) shock absorber, (9) clip nuts

  14.  

To install:

  1. Assemble the components, making sure they are properly aligned.
  2.  
  3. Use a wrench to prevent the shock rod from rotating, then tighten the upper shock mount nut to 37 ft. lbs. (50 Nm).
  4.  
  5. Remove the coil spring compressor.
  6.  
  7. Install the shock absorber assembly on the vehicle. Tighten the upper mounting nuts and lower bolts to 37 ft. lbs. (50 Nm).
  8.  
  9. The remaining installation is the reverse of removal.
  10.  

4-Wheel Drive
  1. Raise and support the vehicle.
  2.  
  3. Remove or disconnect the following:

    Front wheels
     
    Support the lower control arm, then remove the upper shock mounting nut.
     
    Lower mounting bolt
     
    Shock absorber

    Click image to see an enlarged view

    Fig. Exploded view of the shock absorber mounting-4WD 2500 series and 3500 series

     

  4.  

To install:

  1. Install the shock absorber on the vehicle. Tighten the lower mounting bolt to 59 ft. lbs. (80 Nm) and the upper nut to 17 ft. lbs. (24 Nm).
  2.  
  3. The installation is the reverse of removal.
  4.  

Testing & Inspection



The purpose of the shock absorber is simply to limit the motion of the spring during compression and rebound cycles. If the vehicle is not equipped with these motion dampers, the up and down motion would multiply until the vehicle was alternately trying to leap off the ground and to pound itself into the pavement.

Contrary to popular rumor, the shocks do not affect the ride height of the vehicle. This is controlled by other suspension components such as springs and tires. Worn shock absorbers can affect handling; if the front of the vehicle is rising or falling excessively, the -footprint- of the tires changes on the pavement and steering is affected.

The simplest test of the shock absorber is simply push down on one corner of the unladen vehicle and release it. Observe the motion of the body as it is released. In most cases, it will come up beyond it original rest position, dip back below it and settle quickly to rest. This shows that the damper is controlling the spring action. Any tendency to excessive pitch (up-and-down) motion or failure to return to rest within 2-3 cycles is a sign of poor function within the shock absorber. Oil-filled shocks may have a light film of oil around the seal, resulting from normal breathing and air exchange. This should NOT be taken as a sign of failure, but any sign of thick or running oil definitely indicates failure. Gas filled shocks may also show some film at the shaft; if the gas has leaked out, the shock will have almost no resistance to motion.

Click image to see an enlarged view

Fig. When fluid is seeping out of the shock absorber, it-s time to replace the shock

While each shock absorber can be replaced individually, it is recommended that they be changed as a pair (both front or both rear) to maintain equal response on both sides of the vehicle. Chances are quite good that if one has failed, its mate is weak also.

 
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