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13 speed grinding in top gear

Discussion in 'Trucks [ Eighteen Wheelers ]' started by cadams53, Sep 23, 2017.

  1. Sep 23, 2017 #1
    cadams53

    cadams53 Bobtail Member

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    Nov 11, 2013
    0
    I have a 2009 Pro Star with a 13 speed eaton. Everything is fine until I get to top gear, split or not (12-13). Under power its fine, but if I try to maintain a steady speed anywhere from 50 to 70 mph it grinds real bad. If I add power or get off the throttle with the jake engaged it goes away. Impossible to maintain a steady cruise. Has new clutch and input shaft. Any ideas would be greatly appreciated.
     
    cadams53, Sep 23, 2017
    cadams53, Sep 23, 2017
    #1
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  3. Sep 23, 2017 #2
    Roberts450

    Roberts450 Road Train Member

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    Sounds like its time for some new bearings in the back half of the box.
     
    Roberts450, Sep 23, 2017
    Roberts450, Sep 23, 2017
    #2
  4. Sep 23, 2017 #4
    cadams53

    cadams53 Bobtail Member

    2
    0
    Nov 11, 2013
    0
    Yes, it does sound like its coming from the back of the tranny. Thanks for the input.
     
    cadams53, Sep 23, 2017
    cadams53, Sep 23, 2017
    #4
  5. Sep 23, 2017 #4
    lester

    lester Midwest's #1 Feed Hauler

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    Could possibly be your ride height is off. That will make some horrible noises
     
    lester, Sep 23, 2017
    lester, Sep 23, 2017
    #4
  7. Sep 23, 2017 #5
    ExOTR

    ExOTR Windshield Chipper Extraordinaire

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    I had issues with a 13 speed a few years ago that would vibrate hard enough to make the shifter audibly buzz while cruising.
    Broken spring on/in the tranny, company truck so I don't know the exact details. But it took the shop less than 2hrs to diagnose and repair.
     
    ExOTR, Sep 23, 2017
    ExOTR, Sep 23, 2017
    #5
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