Terrible cab drone

Discussion in 'Trucks [ Eighteen Wheelers ]' started by DLament, Jun 21, 2024.

  1. DLament

    DLament Bobtail Member

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    Mar 12, 2022
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    The truck is a 2009 Western Star 4900 daycab with a 14L detroit. I just recently bought the truck, i've put around 4k miles on it, and the cab noise is worse than anything I've ever driven. The truck has all new exhaust from the turbo back, 2 donaldson m100465 mufflers as well as cab mount bushings, zero leaks. At cruise the drone is brain rattling, i think its quieter on the outside than it is in the cab. I also drive an almost identical truck but with a c15 accert that is straight piped all the way out with short stacks and it is actually very quiet and comfortable to drive which is really the reason I bought this truck. I'm thinking of putting high flow mufflers on because it seems really stuffed up and maybe that's causing it to drone so bad?? The way they route the exhaust I don't have room for an other resonator. Any suggestions are appreciated.
     
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  3. OlegMel

    OlegMel Light Load Member

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    Apr 8, 2023
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    Hush mat behind the doors and sleeper panels, as well as under the hood and floor if it’s doable. You don’t need to fill every single inch with it… thing works pretty #### good tho.
     
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  4. blairandgretchen

    blairandgretchen Road Train Member

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    Dec 9, 2011
    South west Missouri
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    Checked it out - did you do the kit, or buy rolls?
     
  5. OlegMel

    OlegMel Light Load Member

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    Apr 8, 2023
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    Actually I used this. Also get application roller, I without order 2 boxes to begin with or measure the areas of cab and sleeper. Before applying I would use rag and alcohol to wipe dust off for better adhesion. Takes a while taking panels apart, but definitely a noticeable difference.
     

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  6. OlegMel

    OlegMel Light Load Member

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    Apr 8, 2023
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    Also I’d buy extra clips for sleeper panels and door panels since few will definitely break
     
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  7. DLament

    DLament Bobtail Member

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    Mar 12, 2022
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    I had the headliner and back panel off to get rid of some lights they had on the roof. I put new insulation in those areas while I had it apart, it didn't seem to help any, although I probably didn't use the best of stuff as it was leftovers from another interior project. I will take a look at this stuff though as it looks like it really seals the cab up nice. The truck is also a daycab so I'm sure that doesn't help my situation any
     
    blairandgretchen Thanks this.
  8. Luwi67

    Luwi67 Heavy Load Member

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    Oct 24, 2012
    Long island
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    If they are strait through mufflers that would be my guess for the drone. Years ago I had Donaldson mufflers with a perforated core went to a cone shape then back to 5". When they rotted out I went with Pitt Power strait through perforated core and noticed the deeper tone and a slight drone, wasn't enough to bother me though.
     
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