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What are some signs of a transmission going bad?

Discussion in 'Questions From New Drivers' started by JohnSmith69, Aug 17, 2020.

  1. Aug 17, 2020 #1
    JohnSmith69

    JohnSmith69 Light Load Member

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    I have a 10 speed Eaton and I've noticed it's making weird grinding noises when I let off the accelerator at 10th gear coming down to 9th and 8th. Do you think my tranny is going bad? I've replaced the clutch less than a year ago and my truck is a 2012 Freightliner with half a million miles.
     
    JohnSmith69, Aug 17, 2020
    JohnSmith69, Aug 17, 2020
    #1
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  3. Aug 17, 2020 #2
    Brettj3876

    Brettj3876 Road Train Member

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    More of a winning noise or does it sound like gears. Check your ride height and carrier bearing/slop in the yoke
     
    Brettj3876, Aug 17, 2020
    Brettj3876, Aug 17, 2020
    #2
    JohnSmith69 and TripleSix Thank this.
  4. Aug 17, 2020 #3
    Ridgeline

    Ridgeline Road Train Member

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    Have a mechanic ride with you or have them test drive it.

    Oh and what was the last oil analysis say about the transmission oil?
     
    Ridgeline, Aug 17, 2020
    Ridgeline, Aug 17, 2020
    #3
    JohnSmith69 Thanks this.
  5. Aug 17, 2020 #4
    TripleSix

    TripleSix God of Roads

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    Mine was a whining noise in the big hole, 17th and 18th gear suddenly grenaded. Dropped to 16th gear and still made my delivery...at 50 mph max speed.
     
    TripleSix, Aug 17, 2020
    TripleSix, Aug 17, 2020
    #4
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  7. Aug 17, 2020 #5
    CropShop

    CropShop Bobtail Member

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    It could also be one of your rear ends. We had a dump truck that started growling after a rebuilt trans was installed. Called trans company and they said check your rears. Found a carrier bearing out in one.
     
    CropShop, Aug 17, 2020
    CropShop, Aug 17, 2020
    #5
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  8. Aug 18, 2020 #6
    baha

    baha Road Train Member

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    1st have the ride hi. ck, replace the air ride Hi. valve and have it adj. to the factory ride Hi. look up the correct setting on the web. and have a tape with you to ck. their work
     
    baha, Aug 18, 2020
    baha, Aug 18, 2020
    #6
    JohnSmith69 Thanks this.
  9. Aug 18, 2020 #7
    MACK E-6

    MACK E-6 Moderator Staff Member

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    Last time I had a carrier bearing let go there was sort of a howl or squeal you would only hear when driving past a stand of trees on the your left, or next to to something that reflects sound like a jersey barrier. It made that noise for a good 20K miles. I tried to tell the parts changers something wasn't right because I could even feel slop in it.

    But what does a driver know? :rolleyes:
     
    MACK E-6, Aug 18, 2020
    MACK E-6, Aug 18, 2020
    #7
    77fib77 Thanks this.
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