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04 T600 bumpy ride between 55-60 mph when bobtail or light load?

Discussion in 'Trucks [ Eighteen Wheelers ]' started by russtrucker, Apr 16, 2019.

  1. Apr 16, 2019 #1
    russtrucker

    russtrucker Road Train Member

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    Mar 27, 2012
    Central PA
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    My dad's 04 T600 has that bumpy feeling when truck drives between 55-60 mph. Bobtail and light weight loaded. Had that same bumpy/jumpy ride since he bought that T600 back in 2011. All suspension components had been replaced. So as tires. Tried that with and without centramatic balancers. Shocks were replaced. Good alignment. The only parts we haven't replaced since purchasing that T600 is drive shaft and some u-joints. What could cause all that despite changing parts?
     
    russtrucker, Apr 16, 2019
    russtrucker, Apr 16, 2019
    #1
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  3. Apr 17, 2019 #2
    boneebone

    boneebone Road Train Member

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    Replace the front cab mount bushings and cab shocks.
     
    boneebone, Apr 17, 2019
    boneebone, Apr 17, 2019
    #2
  4. Apr 17, 2019 #3
    russtrucker

    russtrucker Road Train Member

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    Central PA
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    We got those replaced a while ago. Still does the same bumpy feeling.
     
    russtrucker, Apr 17, 2019
    russtrucker, Apr 17, 2019
    #3
  5. Apr 17, 2019 #4
    Goodysnap

    Goodysnap Road Train Member

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    Have you considered the possibility that it's just the way it is and maybe theres nothing broken or worn. What are you comparing it too?
     
    Goodysnap, Apr 17, 2019
    Goodysnap, Apr 17, 2019
    #4
    Big Road Skateboard Thanks this.
  7. Apr 17, 2019 #5
    russtrucker

    russtrucker Road Train Member

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    Other T600s we have
     
    russtrucker, Apr 17, 2019
    russtrucker, Apr 17, 2019
    #5
  8. Apr 17, 2019 #6
    Goodysnap

    Goodysnap Road Train Member

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    Suspension and cab ride height? Axle angles within spec?

    The description "bumpy ride" doesnt offer much, thus the lack of response.
    Is it a vibration or is it harshness of the ride quality when hitting imperfections in the road surface?
     
    Goodysnap, Apr 17, 2019
    Goodysnap, Apr 17, 2019
    #6
    062 Thanks this.
  9. Apr 17, 2019 #7
    russtrucker

    russtrucker Road Train Member

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    Mar 27, 2012
    Central PA
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    harshness of the ride quality between 55-60, on any road surface.
     
    russtrucker, Apr 17, 2019
    russtrucker, Apr 17, 2019
    #7
  10. Apr 17, 2019 #8
    062

    062 Road Train Member

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    How much play is in pinions? They can cause it to feel like a tire out of round. Carrier bearing generally will be there all the time after a certain speed, but you never know.
     
    062, Apr 17, 2019
    062, Apr 17, 2019
    #8
  11. Apr 17, 2019 #9
    russtrucker

    russtrucker Road Train Member

    1,767
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    Mar 27, 2012
    Central PA
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    Well, we haven't touch the differential axles yet other than changing gear oil. Maybe. Drive shaft and differential are the possibility since we haven't done work on em other than lubing.
     
    russtrucker, Apr 17, 2019
    russtrucker, Apr 17, 2019
    #9
  12. May 29, 2023 #10
    Soon2BeOwnerOperator

    Soon2BeOwnerOperator Light Load Member

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    Feb 13, 2019
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    Did you ever figure it out? Could it be a kingpin needing replacment?
     
    Soon2BeOwnerOperator, May 29, 2023
    Soon2BeOwnerOperator, May 29, 2023
    #10
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