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Eaton fuller 10spd. High gears not staying engaged

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by ryantcastro92, May 23, 2022.

  1. May 23, 2022 #1
    ryantcastro92

    ryantcastro92 Bobtail Member

    3
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    Mar 5, 2019
    0
    Hello fellas, I'm new to this thread. My issue is with an Eaton Fuller 10 speed. It shifts perfectly; from reverse to 5th gear, but as soon as I shift to high gear (6th), it does not shift. All high gears feel like they slip
     
    ryantcastro92, May 23, 2022
    ryantcastro92, May 23, 2022
    #1
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  3. May 23, 2022 #2
    jamespmack

    jamespmack Road Train Member

    19,140
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    RT,RTO or FRO trans model?
     
    jamespmack, May 23, 2022
    jamespmack, May 23, 2022
    #2
  4. May 23, 2022 #3
    MadScientist

    MadScientist Light Load Member

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    143
    Dec 14, 2019
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    Or RTL(O) "Super 10"?
     
    MadScientist, May 23, 2022
    MadScientist, May 23, 2022
    #3
  5. May 23, 2022 #4
    Big Road Skateboard

    Big Road Skateboard Road Train Member

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    May 2, 2021
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    Probably synchro slider not going into aux drive gear, likely due to a broken synchro pin. Use shop air and operate it that way.

    If still no high, it's probably got to come apart
     
    Last edited: May 23, 2022
    Big Road Skateboard, May 23, 2022
    Big Road Skateboard, May 23, 2022
    #4
    Bean Jr. Thanks this.
  7. May 23, 2022 #5
    jamespmack

    jamespmack Road Train Member

    19,140
    207,218
    Mar 25, 2014
    OH
    0

    Still a RT trans.

    Fro would most likely be snap ring on shaft. And yes the inner one under top plate.

    But no sense in diagnosis with no model.

    Eaton Service ranger is a good website.
     
    jamespmack, May 23, 2022
    jamespmack, May 23, 2022
    #5
    Bean Jr., Oxbow, spsauerland and 2 others Thank this.
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