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Vibration between 30 - 40 MPH

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Cbrannum, Oct 26, 2020.

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  1. Oct 26, 2020 #11
    Cbrannum

    Cbrannum Bobtail Member

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    I have super singles. So I guess that’s one situation I am glad I do. Lol
     
    Cbrannum, Oct 26, 2020
    Cbrannum, Oct 26, 2020
    #11
    stillwurkin Thanks this.
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  3. Oct 26, 2020 #12
    stillwurkin

    stillwurkin Road Train Member

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    If one is bad, the power loss should be noticeable. Thats on a dead missfire.
     
    stillwurkin, Oct 26, 2020
    stillwurkin, Oct 26, 2020
    #12
    Cbrannum Thanks this.
  4. Oct 26, 2020 #13
    Cbrannum

    Cbrannum Bobtail Member

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    Truck has 860k miles and is an automatic. From
    Don’t have any power loss.
     
    Cbrannum, Oct 26, 2020
    Cbrannum, Oct 26, 2020
    #13
    stillwurkin Thanks this.
  5. Oct 26, 2020 #14
    Cattleman84

    Cattleman84 Road Train Member

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    I'd start with drive train behind the transmission... Check driveline, u-joimts, carrier bearing, rear ends, ECT. If that all looks good maybe check the front end, shocks, suspension, King pins, ECT.

    Edit: maybe an out of round tire???
     
    Cattleman84, Oct 26, 2020
    Cattleman84, Oct 26, 2020
    #14
    GYPSY65, Cbrannum, stillwurkin and 1 other person Thank this.
  7. Oct 26, 2020 #15
    LameMule

    LameMule Road Train Member

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    If you're near the truck just grab the driveline and give it all you got and you'll feel a very slight clunk if its worn. At 35 to 40mph it would be pretty significant.
     
    LameMule, Oct 26, 2020
    LameMule, Oct 26, 2020
    #15
    User666, Cbrannum and stillwurkin Thank this.
  8. Oct 26, 2020 #16
    Cbrannum

    Cbrannum Bobtail Member

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    Truck has 860k miles and is an automatic. The shaking/vibration is noticeably worse when I am on the accelerator. It does not seem to matter what gear or rpm though. I have went through that range in every gear the transmission would let me.
     
    Cbrannum, Oct 26, 2020
    Cbrannum, Oct 26, 2020
    #16
  9. Oct 26, 2020 #17
    Cbrannum

    Cbrannum Bobtail Member

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    I just had the king pins replaced and all the tires rotated and balanced. I know I need to replace my shocks. That is next on my fix it list after this issue that popped up.
     
    Cbrannum, Oct 26, 2020
    Cbrannum, Oct 26, 2020
    #17
  10. Oct 26, 2020 #18
    Cbrannum

    Cbrannum Bobtail Member

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    I’ll check that tomorrow when it gets daylight.
     
    Cbrannum, Oct 26, 2020
    Cbrannum, Oct 26, 2020
    #18
  11. Oct 26, 2020 #19
    Cattleman84

    Cattleman84 Road Train Member

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    An out of round tire will still cause a hop or vibration even if properly balanced. But if they are not new tires thats probably unlikely to be the issue, unless it started when you first got the tires.
     
    Cattleman84, Oct 26, 2020
    Cattleman84, Oct 26, 2020
    #19
    Cbrannum and LameMule Thank this.
  12. Oct 26, 2020 #20
    LameMule

    LameMule Road Train Member

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    When looking for a worn ujoint you'll want to grab the driveline as close to the ujoint as possible to reduce the amount of effort needed to find play in it. Also check the slip yoke for excessive wear.
     
    LameMule, Oct 26, 2020
    LameMule, Oct 26, 2020
    #20
    Cbrannum Thanks this.
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