GM Full-Size Trucks 1980-1987 Repair Guide

Shock Absorbers



See Figures 1 and 2

  1. Raise and support the truck.
  3. Support the rear axle with a floor jack.
  5. If the truck is equipped with air lift shocks, bleed the air from the lines and disconnect the line from the shock absorber.

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Fig. Fig. 1: Loosen the rear shock upper mount. If a stud nut is used, a wrench should be used on the stud flats

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Fig. Fig. 2: Loosen the rear shock lower mount, then remove the shock from the vehicle

  1. Disconnect the shock absorber at the top by removing the nut and washers.
  3. Remove the nut, washers and bolt from the bottom mount.
  5. Remove the shock from the truck.
  7. Installation is the reverse of removal. Torque the upper mount to 150 ft. lbs. (203 Nm). Tighten the lower to 115 ft. lbs. (155 Nm).


Adjust the tire pressure before testing the shocks. If the truck is equipped with heavy duty equipment, this can sometimes be misleading. A stiff ride normally accompanies a stiff or heavy duty suspension. Be sure that all weight in the truck is distributed evenly.

Each shock absorber can be tested by bouncing the corner of the truck until maximum up and down movement is obtained. Let go of the truck. It should stop bouncing in 1-2 bounces. If not, the shock should be replaced.