GM Full-Size Trucks 1988-1998 Repair Information

Pinion Seal

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REMOVAL & INSTALLATION



See Figures 1 through 6

The following special tools, or their equivalents, are required for this procedure: J-8614-1, J-8614-2, J-8614-3, and J-22804.

  1. Raise the vehicle and support it with jackstands.
  2.  
  3. Remove the driveshaft.
  4.  
  5. Using a Holding Bar Tool J-8614-1, attached to the pinion shaft flange, remove the self locking nut and washer from the pinion shaft.
  6.  



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Fig. Fig. 1: Measuring pinion rotating torque



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Fig. Fig. 2: Scribed marks



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Fig. Fig. 3: Removing or installing the pinion nut



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Fig. Fig. 4: Removing the pinion flange



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Fig. Fig. 5: Installing the pinion seal



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Fig. Fig. 6: Installing the pinion flange

  1. Install Tool J-8614-2, and 3 into the holding bar and remove the flange from the drive pinion. Remove the drive pinion from the carrier.
  2.  
  3. With a long drift, tap on the inner race of the outer pinion bearing to remove the seal.
  4.  

To install:
  1. Install the oil seal, gasket and using Tool J-22804 install the oil seal.
  2.  
  3. Install the flange, washer and nut and tighten the nut to 270 ft. lbs. (366 Nm) for the GMC axle; 255 ft. lbs. (346 Nm) for the Dana axle.
  4.  
  5. Install the driveshaft and lower the vehicle.
  6.  

 
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