GM Full-Size Trucks 1970-1979 Repair Guide

Differential Carrier

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REMOVAL & INSTALLATION 3 / 4 and 10 1 / 2 in. Ring Gears



Dana 9

  1. Raise and support the vehicle safely. Allow the rear axle assembly to hang freely. Remove the tire and wheel assemblies. Drain the lubricant.
  2.  
  3. Remove the axle shaft to hub retaining nuts. Rap the axle shaft to loosen it from the hub. Remove the shafts.
  4.  
  5. Remove the cap screws and lock washers retaining the cover to the carrier. Remove the carrier cover and gasket.
  6.  
  7. Mark one side of the carrier and matching cap for reassembly in the same position. Remove the bearing caps.
  8.  
  9. Using a spreader tool and a dial indicator gauge, spread the carrier assembly to a maximum of 0.015 in.
  10.  
  11. Remove the dial indicator tool. Use a prybar and remove the differential case from the carrier.
  12.  
  13. Record the dimension and location of the side bearing shims. Remove the spreader tool.
  14.  
  15. Installation is the reverse of the removal procedure.
  16.  

Rockwell 12 in. Ring Gear
  1. As required, raise and support the vehicle safely. Drain the lubricant.
  2.  
  3. Remove the axle shaft from the drive unit and housing. Disconnect the universal at the pinion shaft.
  4.  
  5. Remove the carrier to housing stud nuts and washers. Loosen the two top nuts and leave the studs to prevent the carrier from falling.
  6.  
  7. Break the carrier loose from the axle housing using the proper hammer.
  8.  
  9. Installation is the reverse of the removal procedure. Observe the following carrier-to-housing tightening specifications:
  10.  



1 / 2 in. x 20 fasteners: 102 ft. lbs. (138 Nm)
 
5 / 8 in. x 18 fasteners: 205 ft. lbs. (278 Nm)
 
3 / 4 in. x 16 fasteners: 360 ft. lbs. (488 Nm)
 

 
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