Chevrolet Full Size Cars 1979-1989

Pinion Seal

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REMOVAL & INSTALLATION





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Fig. Fig. 1 Use a suitable flange holder to secure the flange while loosening or tightening the retaining nut



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Fig. Fig. 2 Pinion companion flange removal



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Fig. Fig. 3 Install the pinion oil seal with a driver/seal installer tool

  1. Raise and support the vehicle safely using jackstands. If the rear of the vehicle is lower than the front, less gear oil will be lost during the procedure.
  2.  
  3. Matchmark the driveshaft and the pinion companion flange so that they can be reassembled in the same position.
  4.  
  5. Disconnect the driveshaft from the pinion companion flange and remove it or support it up in the body tunnel by wiring it to the exhaust pipe.
  6.  

If the joint bearing caps are not retained by a retainer strap, use a piece of tape to hold the bearing caps on their trunnions.

  1. Matchmark the position of the companion flange, pinion shaft and nut, so that the proper pinion bearing preload can be maintained upon reassembly.
  2.  
  3. Using Tool J-8614-10 to hold the pinion companion flange, remove the flange retaining nut and washer.
  4.  
  5. With a suitable container in place to hold any fluid that may drain from the rear axle, remove the pinion companion flange with Tool J-8614-10 or an equivalent puller.
  6.  
  7. Remove the seal by driving it out with a blunt chisel.
  8.  


WARNING
When driving out the old seal, be extremely careful not to damage the carrier or sealing surfaces.

  1. Examine the pinion companion flange for any nicks or damage. If so, replace it.
  2.  
  3. Examine the pinion seal bore in the carrier and remove any burrs.
  4.  

To install:

  1. Using Tool J-23911, or equivalent, install a new seal.
  2.  
  3. Apply Special Seal Lubricant, No. 1050169 or equivalent to the O.D. of the pinion flange and sealing lip of the new seal.
  4.  
  5. Install the pinion companion flange and nut, then tighten the nut 1 / 16 in. beyond the alignment marks in order to compensate for the new parts.
  6.  
  7. Align the marks made earlier, then install the driveshaft assembly.
  8.  
  9. Check and add fluid to the rear axle, as necessary.
  10.  
  11. Remove the jackstands, then carefully lower the vehicle.
  12.  

 
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