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 on a hoist.
  2.  
  3. Remove the tire and wheel.
  4.  
  5. Remove the brake calipers.
  6.  
  7. Remove the differential carrier assembly shield, if equipped.
  8.  
  9. Reference mark the relationship of the propeller shaft to the front axle pinion yoke.
  10.  
  11. Remove the propeller shaft.
  12.  
  13. Tie the propeller shaft to a frame rail or the crossmember.
  14.  
  15. Measure the torque required in order to rotate the pinion. Record the torque value for reassembly.

    Click image to see an enlarged view

    Fig. Measuring the turning torque of the pinion

  16.  
  17. Scribe a line on the pinion stem, the pinion nut and the companion flange. Record the number of exposed threads on the pinion stem.
  18.  
  19. Remove the nut.
  20.  
  21. Position tool J8614-01 on the flange so that the 4 notches on the tool face the flange.
  22.  
  23. Remove the flange. Use the special nut and the forcing screw.
    NOTE
    Carefully pry the seal from the bore. Do not distort or scratch the aluminum case.

  24.  
  25. Remove the oil seal.
  26.  
  27. Inspect the pinion flange for a smooth oil seal surface. Inspect the pinion flange for worn drive splines. Replace the pinion flange if necessary.
  28.  
  29. Remove the dust deflector.
  30.  

To install:


NOTE
Stake the new deflector at 3 new equally spaced positions. You must stake the new deflector in such a way that you do not damage the seal operating surface.

  1. Install and stake the dust deflector on the flange.
  2.  
  3. Position the oil seal in the bore. Then place a driver over the oil seal. Strike the driver with a hammer until the seal flange seats on the axle housing surface. Drive the seal in straight, not at an angle, as this will damage the aluminum housing.
    NOTE
    Do not hammer the pinion flange/yoke onto the pinion shaft. Pinion components may be damaged if the pinion flange/yoke is hammered onto the pinion shaft.

  4.  
  5. Install the flange onto the pinion using tool J8614-01. Place the washer and a new nut on the pinion threads. Tighten the nut to the original scribed position using the scribe marks and the exposed threads as reference.
  6.  
  7. Measure the rotating torque of the pinion. Compare the measurement with the rotating torque recorded earlier. Tighten the pinion nut by small increments until the torque required in order to rotate the pinion is 3-5 inch lbs. (0.40-0.57 Nm) greater than the original torque.
  8.  
  9. Install the propeller shaft.
  10.  
  11. Install the differential carrier assembly shield, if equipped.
  12.  
  13. Install the brake calipers
  14.  
  15. Install the tire and wheel.
  16.  
  17. Lower the vehicle.
  18.  

 
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