9 speed Eaton won't shift into low range?

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by 704mover, Dec 8, 2019.

  1. 704mover

    704mover Light Load Member

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    Mar 8, 2018
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  3. 704mover

    704mover Light Load Member

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    Mar 8, 2018
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    Air slave is working, air plunger on the rear of the case that's behind the 4 bolt cover is working with a good o ring, i actually pulled the transmission yesterday and am gonna replace it today with another one from my parts truck. Thanks Although I may tear it apart to learn what happened first. I have nothing to lose.
     
  4. JGDumpTruckServices

    JGDumpTruckServices Bobtail Member

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    Nov 4, 2021
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  5. JGDumpTruckServices

    JGDumpTruckServices Bobtail Member

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    Nov 4, 2021
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    Did you ever find out what the problem was? I’m have the same issue with my Eaton 8 speed. Does not move from 1-4, but works great 5-8. Please let me know what you found
     
  6. JGDumpTruckServices

    JGDumpTruckServices Bobtail Member

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    Nov 4, 2021
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    Please let me know what you found with your 9 speed.
    Did you ever find out what the problem was? I’m have the same issue with my Eaton 8 speed. Does not move from 1-4, but works great 5-8. Please let me know what you found
     
  7. Wimpie

    Wimpie Bobtail Member

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    Nov 22, 2023
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    I have a problem with my 10 speed fuller.
    It splits into hi but would not split down until the truck is at a stand still.
    Valves are working fine and has good air. Could it be the friction clutch?
     
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