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Noise in transmission or clutch

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by mike216, Feb 23, 2022.

  1. Feb 23, 2022 #1
    mike216

    mike216 Bobtail Member

    44
    13
    Dec 15, 2013
    Cordova,Md
    0
    Have a 2015 389 Pterbilt.600 Cummins with 18spd autoshift. 520000 miles. When decelerating, a bang noise can be heard. You can run around yard,doesn’t matter what gear or speed or rpm. when you let off the throttle you can hear a bang.Sounds like in clutch. Checked all mounts. Everything looks tight.
     
    mike216, Feb 23, 2022
    mike216, Feb 23, 2022
    #1
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  3. Feb 23, 2022 #2
    BoxCarKidd

    BoxCarKidd Road Train Member

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    6,465
    Aug 26, 2014
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    I never head a clutch do that. Check rear suspension bushings. Check for metal in rears. Does it do it with the power divider locked? Does it do it in 15 through 18th gear?
     
    BoxCarKidd, Feb 23, 2022
    BoxCarKidd, Feb 23, 2022
    #2
  4. Feb 24, 2022 #3
    mike216

    mike216 Bobtail Member

    44
    13
    Dec 15, 2013
    Cordova,Md
    0
    Thanks , all that looks good. The noise sounds like it’s under firewall.
     
    mike216, Feb 24, 2022
    mike216, Feb 24, 2022
    #3
  5. Feb 24, 2022 #4
    rustymike

    rustymike Bobtail Member

    28
    29
    Dec 17, 2021
    0
    If that truck has a driveshaft support bearing, check it for play in the bearing and the rubber surrounding the bearing.
     
    Last edited: Feb 24, 2022
    rustymike, Feb 24, 2022
    rustymike, Feb 24, 2022
    #4
    Magoo1968 Thanks this.
  7. Feb 24, 2022 #5
    BoxCarKidd

    BoxCarKidd Road Train Member

    4,429
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    Aug 26, 2014
    0
    All the transmission and flywheel bolts tight. Housings not cracked?
     
    BoxCarKidd, Feb 24, 2022
    BoxCarKidd, Feb 24, 2022
    #5
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