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    2001 GMC Truck Sierra 2500 4WD 6.0L SFI 8cyl

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    ISUZU Amigo/Pick-ups/Rodeo/Trooper 1981-1996

    Pinion Seal

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    REMOVAL & INSTALLATION



    See Figures 1, 2, 3 and 4



    Click image to see an enlarged view

    Fig. Fig. 1: Exploded view of the front differential flange, pinion seal and related components



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    Fig. Fig. 2: Before draining the differential fluid out the drain hole, make certain that the filler plug can be removed



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    Fig. Fig. 3: Use a flange holding tool while loosening and tightening the flange nut-Tool J-37221 is specifically for Trooper models, other models similar



    Click image to see an enlarged view

    Fig. Fig. 4: Install a new pinion seal by driving it into place with the Tool J-24250 (or equivalent) and a hammer

    1981-94 Models
    1. Apply the parking brake and block the rear wheels.
    2.  
    3. Raise and safely support the front of the vehicle on jackstands. If necessary, remove the skid plate.
    4.  
    5. Matchmark and remove the driveshaft, as described earlier in this section.
    6.  
    7. Using a torque meter, check the turning torque of the pinion before proceeding. This is the torque that must be reached during installation of the pinion nut.
    8.  
    9. Using a pinion flange holding tool, remove the pinion nut and washer.
    10.  
    11. Remove the pinion flange (driveshaft yoke) from the pinion gear.
    12.  
    13. Remove the dust cover, if equipped.
    14.  
    15. Pry the pinion seal out of the differential carrier.
    16.  
    17. Clean and inspect the sealing surface of the carrier.
    18.  

    To install:
    1. Apply oil to the lip of the seal.
    2.  
    3. Using a seal driver tool, drive the new seal into the carrier until the flange on the seal is flush with the carrier.
    4.  
    5. If applicable, install the dust shield.
    6.  
    7. Install the pinion flange (driveshaft yoke).
    8.  
    9. With the seal installed, the pinion bearing preload must be set. Tighten the pinion nut while holding the flange, until the turning torque is the same as before removal of the nut.
    10.  
    11. Align the matchmarks and install the driveshaft.
    12.  
    13. Check the level of the differential lubricant when finished.
    14.  
    15. Lower the vehicle and remove the rear wheel blocks.
    16.  

    1995-96 Models
    1. Apply the parking brake and block the rear wheels.
    2.  
    3. Safely raise and support the front of the vehicle on jackstands.
    4.  
    5. Matchmark the front driveshaft, then remove the bolts attaching the driveshaft to the front axle flange.
    6.  
    7. Remove the driveshaft from the pinion flange and support it out of the way.
    8.  
    9. Note the number of threads of the pinion gear that protrude from the flange nut, this will help to obtain the proper pinion bearing preload during installation. Remove the flange nut. Use a flange holding wrench (J-8614-01 for Pick-Up models, J-37221 for Trooper models, J-8614-01 for Rodeo models, or equivalent) when removing the flange nut.
    10.  
    11. Place a suitable container under the differential to catch any gear oil.
    12.  
    13. Remove the flange and dust cover from the front differential.
    14.  
    15. Remove the pinion oil seal from the differential.
    16.  

    To install:
    1. Lubricate the new oil seal with axle lubricant.
    2.  
    3. Install the new oil seal with a seal installer (J-24250 or equivalent).
    4.  
    5. Install the dust cover and the flange.
    6.  
    7. Lubricate the pinion threads, then install a new flange nut. Tighten the flange nut to 66-101 ft. lbs. (89-137 Nm) for a used pinion bearing, or to 130-203 ft. lbs. (177-275 Nm) for a new bearing. Do not overtighten the flange nut.
    8.  
    9. Measure the pinion bearing preload with a torque meter, the starting torque should be 3.9 inch lbs. (0.44 Nm), or if a new pinion bearing was installed, the torque should be 7.8 inch lbs. (0.88 Nm).
    10.  
    11. Stake the flange nut at 2 locations and recheck the bearing preload (readjust the preload if necessary).
    12.  
    13. Install the front driveshaft, tighten the driveshaft nut and bolts to 46 ft. lbs. (63 Nm).
    14.  
    15. Check the level of lubricant in the front axle and add, if necessary.
    16.  
    17. Lower the vehicle and remove the rear wheel blocks.
    18.  

     
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