GM Buick/Oldsmobile/Pontiac/Full-Size 1975-1990 Repair Guide

Pinion Seal

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REMOVAL & INSTALLATION



See Figures 1 and 2

  1. Raise the vehicle and support with jackstands.
  2.  
  3. Mark the driveshaft and pinion yoke for reinstallation. Remove the driveshaft from the pinion yoke and wire it up to the frame. Tape the U-joint caps in place to prevent dirt from entering the U-joint.
  4.  
  5. Mark the position of the pinion yoke, pinion gear shaft and pinion yoke nut so the proper bearing preload can be maintained.
  6.  
  7. Place a drain pan under the pinion yoke. Remove the pinion nut and washer using a pinion yoke remover J-8614-10 or equivalent.
  8.  
  9. Remove the pinion yoke using removing tools J-8614-2, J-8614-3 and J-8614-10.
  10.  
  11. Remove the seal with a slide hammer or by driving it out of the carrier with a blunt chisel. Do NOT damage the carrier.
  12.  

To install:
  1. Clean all dirt, varnish, nicks and tool marks off of the yoke seal carrier with a small file or fine emery cloth.
  2.  
  3. Install a new pinion seal using a seal installer J-23911 or J-22388.
  4.  
  5. Lubricate the seal with differential fluid.
  6.  
  7. Install the pinion yoke, washer and nut.
  8.  
  9. Using the yoke holding tool, torque the nut to 1 / 16 in. (1.6mm) past the alignment marks.
  10.  
  11. Install the driveshaft to the marks positions and lower the vehicle.
  12.  



Click image to see an enlarged view

Fig. Fig. 1: Removing the pinion nut and yoke



Click image to see an enlarged view

Fig. Fig. 2: Installing the pinion seal

 
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