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Thread: Vibration - Drive shaft?

  1. #1
    Nothing but a Thing ERAUGrad04's Avatar
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    Vibration - Drive shaft?

    Hi all!

    Looking for a little input on a slight vibration that I have been chasing since installing my lift and tires. The vibration comes on around 50mph and gets stronger the faster I go. To be fair, the vibration is slight, but noticeable.

    The Jeep is a 2014 Unlimited Rubicon with about 1,500mi on it. The lift setup is a 3.5AEV with the 5160 Bilsteins along with the Fox ATS steering stabilizer, Dynatrac ball joints and a Synergy track bar. The tires are 35" BFG KM2s mounted on 17" AEV Pintler wheels. I did all the mods within about 100th of being new.

    I've had the tires balanced probably 5 times now including a road force balance on a Hunter 9700 balancing machine. Everything points to the tires being balanced.

    I'm starting to wonder if I have a driveline vibration. The front drive shift is stock and has not been off road yet. I know the front DS is prone to the boot failing on the taller lifts and is currently on my radar for replacement.

    All said, are the factory shafts prone to vibration at lift heights similar to mine? I am thinking about pulling the front DS this afternoon and see how it rides, but was curious if anyone has any thoughts or similar experiences.

    Maybe I am just expecting a smoother ride from a 3.5" lift and 35" mud terrains. If that's the case, just tell me and I'll get over it and go have a beer!

    Thanks all!
    ERAU
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  2. #2
    Old Timer 2013rubirick's Avatar
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    Is the vibration coming from the steering wheel or the jeep its self

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    Been Around the Block Buster3479's Avatar
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    Pull the front driveshaft and take it for a ride. It won't cost you anything but a little time. I installed a 3.5 RS over a year ago and had tire balance issues. It always happened between 50 and 57 mph. It sounds like you've covered that (took a road force for me to do so). I later had vibes from a front 1310 driveshaft I didn't seat properly, but that was a very different feeling. Check your track bar bolts for tightness while you're under there (more death wobble than vibration).
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    Administrator wayoflife's Avatar
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    If you're still running a factory front shaft, I doubt that's where it's coming from. But, just to be sure, does the vibration oscillate or is it constant at that speed?

  5. #5
    Nothing but a Thing ERAUGrad04's Avatar
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    Quote Originally Posted by 2013rubirick View Post
    Is the vibration coming from the steering wheel or the jeep its self

    Sent from my SAMSUNG-SGH-I537 using WAYALIFE mobile app
    I would say its more the Jeep than the steering wheel. It's not a major vibration, just noticeable enough...
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  6. #6
    Nothing but a Thing ERAUGrad04's Avatar
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    Quote Originally Posted by Buster3479 View Post
    Pull the front driveshaft and take it for a ride. It won't cost you anything but a little time. I installed a 3.5 RS over a year ago and had tire balance issues. It always happened between 50 and 57 mph. It sounds like you've covered that (took a road force for me to do so). I later had vibes from a front 1310 driveshaft I didn't seat properly, but that was a very different feeling. Check your track bar bolts for tightness while you're under there (more death wobble than vibration).
    I just re-torqued all of the suspension bolts about 500 miles ago and paint lined all nuts/bolts while I was at it.

    I am kinda thinking it is still a tire issue, but just trying to rule out all other options.

    Thanks for the suggestion on the DS. I should get a chance to pull the DS later this week.
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  7. #7
    Nothing but a Thing ERAUGrad04's Avatar
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    Quote Originally Posted by wayoflife View Post
    If you're still running a factory front shaft, I doubt that's where it's coming from. But, just to be sure, does the vibration oscillate or is it constant at that speed?
    With the factory shaft, I really don't expect it to be the source of the vibration like you say.

    I would say that it is relatively constant, but minimal. I am starting to think that I am just chasing the slight vibration that is to be expected with 35" MTs....

    As a side note Eddie, I think I remember seeing you are down in the SoCal area and it looks like we are just going to miss you guys. We are headed down to the LA area tomorrow with a stop off in Pismo Beach.

    Next time you guys find yourself in the Bay Area, let me know!

    Morgan
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  8. #8
    Administrator wayoflife's Avatar
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    Okay, if it were really your front drive shaft, the vibration would oscillate like a sine wave. If it's relatively constant, it's most likely something else - maybe you're feeling the lug thumps of your MT's.

    Also, we're back up north now and will have to get some kind of run going soon.

  9. #9
    Been Around the Block Sithwindu's Avatar
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    Quote Originally Posted by wayoflife View Post
    Okay, if it were really your front drive shaft, the vibration would oscillate like a sine wave. If it's relatively constant, it's most likely something else - maybe you're feeling the lug thumps of your MT's.

    Also, we're back up north now and will have to get some kind of run going soon.
    Yeah I think it's your mt's brotha. I have mud grapplers and feel a slight vibration but it's from the aggressiveness of the tire.

  10. #10
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    Did you road force those puppies ?
    Up Until my last balance .. I always had a small vibe at 60-70. Last shop was finally able to fix it. I will be going back there again.
    I'm guessing tires too.

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