GM Full-Size Trucks 1970-1979 Repair Guide

Shock Absorbers



See Figures 1 and 2

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Fig. Fig. 1: Remove the fasteners securing the shock absorber ...

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Fig. Fig. 2: ... then remove the shock absorber from the vehicle

  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.
  7. Disconnect the shock absorber at the top by removing the nut and washers.
  9. Remove the nut, washers and bolt from the bottom mount.
  11. Remove the shock from the truck.
  13. Installation is the reverse of removal. Tighten the upper mount to 140 ft. lbs. (190 Nm) for vehicles through 1977, or to 150 ft. lbs. (203 Nm), for 1978-79 vehicles. Tighten the lower mount to 115 ft. lbs. (156 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.