GM Full-Size Trucks 1970-1979 Repair Guide

Leaf Spring

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REMOVAL & INSTALLATION



See Figure 1



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Fig. Fig. 1: Leaf spring mounting

  1. Raise the vehicle and support it so that there is no tension on the leaf spring assembly.
  2.  
  3. Loosen the spring-to-shackle retaining bolts. (Do not remove these bolts).
  4.  
  5. Remove the securing bolts which attach the shackle to the spring hanger.
  6.  
  7. Remove the nut and bolt which attach the spring to the front hanger.
  8.  
  9. Remove the U-bolt nuts and remove the spring plate.
  10.  
  11. Pull the spring from the vehicle.
  12.  
  13. Inspect the spring and replace any damaged components.
  14.  

To install:

The 1975 and later3/4ton and 1 ton trucks use bushings that are staked in place. The stakes must first be straightened. When a new bushing is installed stake it in 3 equally spaced locations. Using a press or vise, remove the bushing and install the new one.

  1. Place the spring assembly onto the axle housing.
  2.  

The shackle assembly must be attached to the rear spring eye before the rear shackle is installed.

  1. Position the spring retaining plate and the U-bolts (loosely).
  2.  
  3. It will be necessary to jack the frame in some manner to align the spring and shackle with the spring hangers.
  4.  
  5. Install the shackle bolt and nut and reposition the spring if necessary in order to align the front eye. Position the front eyebolt and nut.
  6.  
  7. Tighten the hanger and shackle fasteners to 90 ft. lbs. (122 Nm) for 1973-76 vehicles or to 110 ft. lbs. (149 Nm) for 1977-79 vehicles.
  8.  

Make sure that the bolts are free turning in their bushings prior to torquing.

  1. Lower the truck so that the weight is on the suspension components. Tighten the U-bolt nuts to 140 ft. lbs. (190 Nm).
  2.  
  3. Carefully lower the truck completely and remove the jacks.
  4.  

 
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