Escalade, Suburban 1500 & 2500, Tahoe, Yukon, Yukon XL 1500 & 2500 (2006-2007), Yukon Denali and Yukon Denali XL (2005-2006)

Pinion Seal

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Removal & Installation



  1. Raise the vehicle.
  2.  
  3. Remove the tire and wheel assemblies.
  4.  
  5. Remove the rear brake calipers and rotors or drums.
  6.  
  7. Remove the axle shafts on 10.5 inch and 11.5 inch axles.
  8.  
  9. Reference mark the rear propeller shaft to the rear axle pinion yoke.
  10.  
  11. Disconnect the propeller shaft from the axle.
  12.  
  13. Measure the torque required to turn the pinion. Record the torque number measurement which gives the combined pinion bearing, seal, carrier bearing, axle bearing and seal preload.
  14.  
  15. Make and accurate alignment mark on the pinion flange. Record the number of exposed threads on the pinion stem.
  16.  
  17. Remove the pinion flange nut and the washer. Use a container in order to catch any lubricant.
    NOTE
    Use care not to damage any of the machined surfaces.

  18.  
  19. Remove the pinion flange.
    NOTE
    The pinion flange has an oil seal that is part of the pinion flange assembly. The pinion flange must be inspected to ensure that the seal is not damaged.

  20.  
  21. Pry the oil seal from the bore.
  22.  
  23. Thoroughly clean any foreign material from the contact area. Replace any parts as necessary.

    Click image to see an enlarged view

    Fig. Measuring the turning torque of the pinion

  24.  

To install:

  1. Lubricate the cavity between the lips of the oil seal with wheel bearing lubricant.
  2.  
  3. Install the oil seal into the bore using a driver.
    NOTE
    Do not hammer the pinion flange onto the pinion stem.

  4.  
  5. Install the pinion flange. Use the alignment marks in the installation of the pinion flange.
  6.  
  7. Install the washer and a new nut. Tighten the nut on the pinion stem as close as possible to the alignment marks without going past the marks. Use the alignment marks and the thread count as a reference. Tighten the nut a little at a time. Turn the pinion flange several times after each tightening in order to seat the rollers.
  8.  
  9. Measure the torque required to rotate the pinion flange. Compare this to the original torque. Tighten the pinion nut, in small increments, until the rotating torque is 3 inch lbs. (0.35 Nm) GREATER than the original torque.
  10.  
  11. Align the propeller shaft with the alignment marks. Connect the propeller shaft.
  12.  
  13. Install the axle shafts on 10.5 inch and 11.5 inch axle.
  14.  
  15. Install the rear brake calipers and rotors or drums.
  16.  
  17. Install the tire and wheel assemblies.
  18.  

 
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