Truck vibrates/shakes when fuel tanks are low on fuel

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Slow302, Oct 5, 2019.

  1. Slow302

    Slow302 Medium Load Member

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    Tried rotating rear outside wheels 180 degree and still bounces.
    So its not fuel level, its not drive wheels or tires, not shocks since i reolaced them all. Its not air bag height or leveling valve
    Im running out of options
    Next is new yokes on tranny and frint diff input
    New drive drums
    Remove centermatics on drives
     
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  3. Slow302

    Slow302 Medium Load Member

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    Installed new tranny anf front diff input yoke and also all 4 U joints on driveshaft even all U jointd are only 2 years old but since i had all apart i i did them again. Lets hope this fix vibrations.
     
  4. Slow302

    Slow302 Medium Load Member

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    New yokes on tranny and front diff input didnt help at all. Now im gonna try with new wheels and tires and than drive drums. There is nothing else left. Maybe power devider ?
    Looks like its doing just inder throttle and just little bit cruising with empty trl. Loaded 45k there is about 20% vibrations. Bobtail like 1%
     
  5. Slow302

    Slow302 Medium Load Member

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    So what couses more vibrations when at full or partial throttle. Looks like vibrations are almost gone when cossting. Same thing with jake brake i can feel vibrations when im using them????
    And also this vibrations make sleeper bounce up and down. But its only betweed 58-72 mph. At higher speed it bounce faster but not as hard like at 58-72 mph
     
    Last edited: Oct 12, 2022
  6. kranky1

    kranky1 Road Train Member

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    You may have a valve lash or injector problem. If it shakes when it’s fuelled up or on the Jake but not coasting or low load, the shaking could be coming from the engine.
     
  7. Slow302

    Slow302 Medium Load Member

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    It was doing before platinum inframe. So its not injectors. I can feel slight vibrations if i shut off engine at 65 and kick in neutral, clutch in out in gear i tried all and stil i can feel it. This is coming from something rotating. Did it before i got new tranny, new clutch, old flywheel. Every yoke on driveshaft has been replaced. 4 sets of u joints, ballanced whole driveshaft twice. Even small one between diffs. New carrier bearings. Just did 3 axle alightment. 5 leveling valves. 2 sleeper leveling valves. 5 sets of shocks, two on sleeoer. Every single bushing and mount
    Looks like hood mirrors start shaking first than somehow it transfer vibrations to the cab/sleeper. And whole sleeper bounces up and down about 1 inch. I know it sound crazy.
    I wanna try my old 24" steer wheels but cant find good brand 24" steers these days.
    Also i wanna try take off my Aliarc moose bumper and try it without it
    Like i said before bobtail there is 2% vibrations. My empty dry van 100%, 20k load 80%, 45k )oad 40% vibrations
    I have new shocks on my 2016 wabash trailer. Even installed 8 new alcoa aluminum wheels. Centramatics plus centering sleves. Good tires. Bushing are good. I dont know. Im lost
     
    Last edited: Oct 13, 2022
  8. Slow302

    Slow302 Medium Load Member

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    I got new gopro. Mounted under truck. Nothing shakes. Tranny dies makek noise but i dont think its that. Sleeper does bounce but desnt show much on gopro with angle of sleeper shocks and leveling valve. Next is drive shocks, that is gonna be pita, no much room 5o mount gooro with ag400 suspension. After that steer suspension and under the hood
     
    skallagrime Thanks this.
  9. Slow302

    Slow302 Medium Load Member

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    Im going crazy over this. Taped many videos. Drive suspension doesng bounce as much as steer on flat road. Sleeper bounces fron this vibration issues. So whatever is it makes sleeper bounce about 3/8 up and down. There id also rattle sound from around left side steer. I didnt had time to inspect that.
    Maybe hood mounts since the swivel on two mounts each and than that vibration pushes front end of cab where hood touches cab on two guided bushings ??
    Also sound deadening on oil pan bounces too. Looks like its loose from the front
    These isnt much places to mount magnetic mount i got since there is alot aluminum brackets and sleeper is fiberglass
     
  10. Slow302

    Slow302 Medium Load Member

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    After making a few more videos of steer axle suspension i found out lest steet tire bounces between 40-50 mph and also vibrate whole truch a lot but its different vibration like one i have 60-70 mph. Tire is still good but i want ti switch to 22s since there is good brand no 24s tires anywhere. Si new steel tires and new alcoa wheels are next
     
  11. Slow302

    Slow302 Medium Load Member

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    Looks like ratteling noise is from left leaf spring. It does that once in while. Spring touching abother spring. Thats not issue
     
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