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Spline size for Eaton 8LL? Need clutch brake

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Airman89, Sep 21, 2019.

  1. Sep 21, 2019 #1
    Airman89

    Airman89 Light Load Member

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    looking to order a clutch brake online today but I need to know the shaft size for the Eaton 8LL. Anyone know? I assume it’s 2” but I don’t want to order until I know for sure. Thanks!
     
    Airman89, Sep 21, 2019
    Airman89, Sep 21, 2019
    #1
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  3. Sep 21, 2019 #2
    Goodysnap

    Goodysnap Road Train Member

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    I don't think you would ever need anything other than 2" 10 spline for heavy duty.
     
    Goodysnap, Sep 21, 2019
    Goodysnap, Sep 21, 2019
    #2
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  4. Sep 21, 2019 #3
    starmac

    starmac Road Train Member

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    It would have to be pretty old and a low torque tranny to have anything but a 2 inch. I don't know if the 8ll ever had the smaller one, but could have.
     
    starmac, Sep 21, 2019
    starmac, Sep 21, 2019
    #3
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  5. Sep 21, 2019 #4
    Airman89

    Airman89 Light Load Member

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    That’s why I was unsure, this is a 1988 truck. Thanks for the info guys
     
    Airman89, Sep 21, 2019
    Airman89, Sep 21, 2019
    #4
  7. Sep 21, 2019 #5
    BoxCarKidd

    BoxCarKidd Road Train Member

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    You are pretty safe with that but only way to be sure is measure it.
    Do not recall a smaller input shaft in any above a 9 series transmission. As in RT910.
    Even the Kodiac ten wheel truck around here, Cat 3116 with RTO14?08LL, has a 2 inch shaft. Not much lower power than that in a heavy truck.
     
    BoxCarKidd, Sep 21, 2019
    BoxCarKidd, Sep 21, 2019
    #5
    Airman89 Thanks this.
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