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Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Beanbean, Aug 10, 2025 at 10:51 AM.

  1. Aug 10, 2025 at 10:51 AM #1
    Beanbean

    Beanbean Bobtail Member

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    I own a 2020 Freightliner truck. I recently discovered that the rear differential oil cap was installed backwards by the manufacturer. .
    And crazy things is . Which drain the old oil
    When I found this
    Have anyone met this before? I thought this is the big mistake
     

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    Beanbean, Aug 10, 2025 at 10:51 AM
    Beanbean, Aug 10, 2025 at 10:51 AM
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  3. Aug 10, 2025 at 12:59 PM #2
    SmallPackage

    SmallPackage Road Train Member

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    I’ve heard of this but hadn’t seen it till now. It’s a plug. Same kind as a freeze plug in engine blocks. Dig all the crude out of it and see. Manufactures attempt to make them a “sealed” unit like all the new cars with dipstickless transmissions.
     
    SmallPackage, Aug 10, 2025 at 12:59 PM
    SmallPackage, Aug 10, 2025 at 12:59 PM
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  4. Aug 10, 2025 at 1:22 PM #3
    Beanbean

    Beanbean Bobtail Member

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    at first I didn’t believe it either, but this was the only cap where oil could be added. In the end, I went to the nearest mechanic, and we ran a lot of effort to pull it out.
    This was be installed backward from factory
     

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    Beanbean, Aug 10, 2025 at 1:22 PM
    Beanbean, Aug 10, 2025 at 1:22 PM
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  5. Aug 10, 2025 at 3:26 PM #4
    Diesel Dave

    Diesel Dave Last Few of the OUTLAWS

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    You mean there was no drain plug at the center bottom nor a filler plug on the top or front side ?
     
    Diesel Dave, Aug 10, 2025 at 3:26 PM
    Diesel Dave, Aug 10, 2025 at 3:26 PM
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  7. Aug 10, 2025 at 5:35 PM #5
    062

    062 Road Train Member

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    I can only speak of the ones that I’ve seen, but they have a small 3/8 pipe plug on the front of the diff and seems it’s only the front one. The rear is in the same old spot.
     
    062, Aug 10, 2025 at 5:35 PM
    062, Aug 10, 2025 at 5:35 PM
    #5
    Diesel Dave Thanks this.
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