Chevrolet Blazer/Jimmy 1969-1982 Repair Guide

Axle Shaft, Bearing, and Seal

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REMOVAL & INSTALLATION



Except 1974-82 Locking Differential Axles


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Fig. Fig. 1 Removing the pinion shaft lockscrew



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Fig. Fig. 2 If you do not have an axle bearing installer, a piece of pipe or a socket may be used



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Fig. Fig. 3 A cross-sectional view of the rear axle bearing and oil seal installed



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Fig. Fig. 4 To extract the rear axles, begin by removing the rear differential cover



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Fig. Fig. 5 Turn the differential until you can access the pinion shaft lockscrew. Loosen it ...



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Fig. Fig. 6 ... then remove the lockscrew



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Fig. Fig. 7 Remove the pinion shaft from the differential assembly



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Fig. Fig. 8 Use a magnet to help in the removal of the C-lock from the inner (button) end of the shaft



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Fig. Fig. 9 Pull the shaft out of the axle tube



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Fig. Fig. 10 Use a seal puller to remove the rear axle seal



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Fig. Fig. 11 A seal driver should be used to install the rear axle seal

This procedure applies to all standard rear axles and to those (1969-73) with the optional Positraction limited slip differential.

  1. Support the axle on jackstands.
  2.  
  3. Remove the wheels and brake drums.
  4.  
  5. Clean off the differential cover area, loosen the cover to drain the lubricant, and remove the cover.
  6.  
  7. Turn the differential until you can reach the differential pinion shaft lockscrew. Remove the lockscrew and the pinion shaft.
  8.  
  9. Push in on the axle end. Remove the C-lock from the inner (button) end of the shaft.
  10.  
  11. Remove the shaft, being careful of the oil seal.
  12.  
  13. You can pry the oil seal out of the housing by placing the inner end of the axle shaft behind the steel case of the seal, then prying it out carefully.
  14.  
  15. A puller or a slide hammer is required to remove the bearing from the housing.
  16.  

To install:

  1. Pack the new or reused bearing with wheel bearing grease and lubricate the cavity between the seal lips with the same grease.
  2.  
  3. The bearing has to be driven into the housing. Don't use a drift, you might cock the bearing in its bore. Use a piece of pipe or a large socket instead. Drive only on the outer bearing race. In a similar manner, drive the seal in flush with the end of the tube.
  4.  
  5. Slide the shaft into place, turning it slowly until the splines are engaged with the differential. Be careful of the oil seal.
  6.  
  7. Install the C-lock on the inner axle end. Pull the shaft out so that the C-lock seats in the counterbore of the differential side gear.
  8.  
  9. Position the differential pinion shaft through the case and the pinion gears, aligning the lockscrew hole. Install the lockscrew.
  10.  
  11. Install the cover with a new gasket and tighten the bolts evenly in a criss-cross pattern.
  12.  
  13. Fill the axle with lubricant as specified in .
  14.  
  15. Replace the brake drums and wheels.
  16.  

1974-82 Locking Differential Axles


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Fig. Fig. 12 Position the axle shaft C-lock as illustrated-1974-82 locking differential models

This axle uses a thrust block on the differential pinion shaft.

  1. Follow Steps 1-3 of the preceding procedure.
  2.  
  3. Rotate the differential case so that you can remove the lockscrew and support the pinion shaft so it can't fall into the housing. Remove the differential pinion shaft lockscrew.
  4.  
  5. Carefully pull the pinion shaft partway out and rotate the differential case until the shaft touches the housing at the top.
  6.  
  7. Use a screwdriver to position the C-lock with its open end directly inward. You can't push in the axle shaft till you do this. Do not force the axle shaft in.
  8.  
  9. Push the axle shaft in and remove the C-lock. Remove the axle shaft and repeat steps 4 and 5 for the other shaft.
  10.  
  11. Follow Steps 7-11 of the preceding procedure.
  12.  
  13. Keep the pinion shaft partway out of the differential case while installing the C-lock on the axle shaft. Put the C-lock on the axle shaft and carefully pull out on the axle shaft until the C-lock is clear of the thrust block.
  14.  
  15. Follow Steps 13-16 of the previous procedure.
  16.  



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Fig. Fig. 13 Noise Diagnosis



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Fig. Fig. 14 Lockup Torque Converter Service Diagnosis

 
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