Rear output shaft seal removal

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by mile marker 27, Aug 25, 2025 at 7:16 PM.

  1. mile marker 27

    mile marker 27 Road Train Member

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    IMG_7036.jpeg IMG_7037.jpeg image.jpg I’m needing to replace this rear output shaft seal, on the front drive axle. Not sure what type of rear end this is, as there are no tags. Removed yolk and a seal or part of, came out with it. The remainder is still in the housing. My question is, do I pull this cast retainer ring off to take this seal out? I’ve got the bolts removed from the retainer and when I pull it out the splined shaft is wanting to come with it. Before I go any further, what’s the procedure for removing and replacing this seal?
     
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  3. JB7

    JB7 Heavy Load Member

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    The yoke has a groove worn into it and will likely leak even with a new seal. They sell a seal with a metal ring that will cover the groove which would be cheaper than another yoke.
     
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  4. Big Road Skateboard

    Big Road Skateboard Road Train Member

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    You do not need to remove the bearing cover to replace the seal. Use a heel bar to remove the old seal. The metal ring on the yoke is a dust cover. The new seal kit will come with one.

    You will need to replace the yoke, otherwise your wasting time. Install the new wear ring onto the new yoke.
     
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  5. JB7

    JB7 Heavy Load Member

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    "You will need to replace the yoke" Why when it can be repaired? Never had a problem using a Speedi-Sleeve on an old yoke with a groove worn into it.

    A wear ring, also known as a Speedi-Sleeve or repair sleeve, is used with a new pinion seal to repair an old, worn yoke. It is not necessary for a new yoke, which has a pristine sealing surface.
    • Avoiding a more costly repair: Installing a wear ring allows you to repair the damaged yoke instead of replacing it, which saves you the expense of a new yoke.
     
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  6. mile marker 27

    mile marker 27 Road Train Member

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    Yeah, I don’t see the need in a new yolk, when all I see worn is a replaceable wear sleeve and the seal. You guys just take a chisel and cut these wear sleeves off? Measure thickness, then measure yolk diameter?
     
    Last edited: Aug 26, 2025 at 8:28 AM
  7. JB7

    JB7 Heavy Load Member

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    STEM_PinionSeals_SellSheet_v3r1_fnl_lr.pdf
    Measure bore ID and yoke shaft OD
    Yes, carefully use a chisel to remove the old sleeve. Hit perpendicular to the shaft.
    You may be able to get a number off the old seal. It would be on the inside metal part.
     
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  8. mile marker 27

    mile marker 27 Road Train Member

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    Ok, got everything out. Wear sleeve is separate from dust shield and off the yolk. Seal is removed from differential and it’s a double seal. Napa offers it two ways. Wear sleeve and seal together as a kit or a double seal, that goes into the housing, with no wear sleeve required and is supposed to be the updated version. With the updated version, the dust shield cannot be used. What are y’all’s thoughts. image.jpg
     
  9. mile marker 27

    mile marker 27 Road Train Member

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    I went ahead and pulled the output shaft out just to examine it and clean the sealing surface of the flange to housing. I noticed it has a locking position with the interior of the housing and not 100% reliant on the four exterior bolts to hold it in place. I also figured it’d be easier to put the seal in while the shaft and flange are in a vice. IMG_7042.jpeg
     
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