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Severe Vibration at Low RPM on 2020 Cascadia DD15 – Need Help

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Cihanakbaba, Jul 4, 2025.

Page 2 of 2
  1. Jul 4, 2025 #11
    Cihanakbaba

    Cihanakbaba Bobtail Member

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    It’an automatic transmission. Did you have had the same issue before?
     
    Cihanakbaba, Jul 4, 2025
    Cihanakbaba, Jul 4, 2025
    #11
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  3. Jul 4, 2025 #12
    ElmerFudpucker

    ElmerFudpucker Road Train Member

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    I have seen clutches cause problems before. Does it have a clutch pedal, because you said the problem stopped when you disengaged the clutch.
     
    ElmerFudpucker, Jul 4, 2025
    ElmerFudpucker, Jul 4, 2025
    #12
    cke and blairandgretchen Thank this.
  4. Jul 4, 2025 #13
    Cihanakbaba

    Cihanakbaba Bobtail Member

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    no it’s an automatic transmission doesn’t have any clutch pedal. But when Truck goes neutral it shakes more
     
    Cihanakbaba, Jul 4, 2025
    Cihanakbaba, Jul 4, 2025
    #13
    blairandgretchen Thanks this.
  5. Jul 4, 2025 #14
    blairandgretchen

    blairandgretchen Road Train Member

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    Get the story straight please.


    IMG_9780.jpeg
     
    blairandgretchen, Jul 4, 2025
    blairandgretchen, Jul 4, 2025
    #14
    cke and ElmerFudpucker Thank this.
  7. Jul 4, 2025 #15
    Cihanakbaba

    Cihanakbaba Bobtail Member

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    OK. There is no clutch pedal. It’s an automatic transmission. But you can still shift the gears manually.
     
    Cihanakbaba, Jul 4, 2025
    Cihanakbaba, Jul 4, 2025
    #15
    blairandgretchen Thanks this.
  8. Jul 4, 2025 #16
    ElmerFudpucker

    ElmerFudpucker Road Train Member

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    I have no experience with automatics. Is it automatic or auto shift? I’m sorry but, but the quality of your replies will depend on the accuracy of the information you supply
     
    ElmerFudpucker, Jul 4, 2025
    ElmerFudpucker, Jul 4, 2025
    #16
    cke and blairandgretchen Thank this.
  9. Jul 4, 2025 #17
    Cihanakbaba

    Cihanakbaba Bobtail Member

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    Feb 28, 2025
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    Thank you for your time. It’s not related with transmission
     
    Cihanakbaba, Jul 4, 2025
    Cihanakbaba, Jul 4, 2025
    #17
  10. Jul 4, 2025 #18
    blairandgretchen

    blairandgretchen Road Train Member

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    South west Missouri
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    I’ll second @ElmerFudpucker comments. Have no experience with automatic transmission trucks.

    You’re just lucky there’s a bunch of truckers enjoying some form of a holiday weekend, disinterested enough to respond.

    Are you sure the driveline is intact - like - “Get on a creeper with a bar and wiggle stuff around?”

    Or are you just relying on your mechanics advice?
     
    blairandgretchen, Jul 4, 2025
    blairandgretchen, Jul 4, 2025
    #18
    cke and ElmerFudpucker Thank this.
  11. Jul 4, 2025 #19
    Ridgeline

    Ridgeline Road Train Member

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    Yes, a couple times.
     
    Ridgeline, Jul 4, 2025
    Ridgeline, Jul 4, 2025
    #19
    BoxCarKidd Thanks this.
  12. Jul 4, 2025 #20
    ElmerFudpucker

    ElmerFudpucker Road Train Member

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    Then it sounds like you have it under control. Have a nice day.
     
    ElmerFudpucker, Jul 4, 2025
    ElmerFudpucker, Jul 4, 2025
    #20
    cke and blairandgretchen Thank this.
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