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Thread: Please help me - what's causing my drive shaft to make this noise shifting out of 4lo

  1. #1
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    Question Please help me - what's causing my drive shaft to make this noise shifting out of 4lo

    I have a 2017 automatic JKUR which has had a CV drive shaft for about 3000 miles. Just recently I've been getting this ringing noise when I shift from 4lo back to 4hi. The sound is almost certainly coming from the drive shaft because:

    1. Tapping the drive shaft's body with a wrench yields the exact same sound.
    2. I removed the drive shaft from the t-case and the noise doesn't happen when it's disconnected.


    Here's a short video shifting from 4hi to 4lo demonstrating the issue:

    https://streamable.com/s/uu6ro/lsdktp

    For what it's worth, it also happens occasionally when shifting from Park to Reverse or from Drive to Reverse.

    I can't tell if it's a problem with the T-Case, the drive shaft, or something else in the drive line. I really need some good advice or ideas on this one. Thanks a million for the help!!

  2. #2
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    Quote Originally Posted by tylerbrinks View Post
    ]I removed the drive shaft from the t-case and the noise doesn't happen when it's disconnected.
    I can't watch the video at the moment, but this alone makes me think it's a u-joint on the driveshaft that has play.

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    Quote Originally Posted by JKDream View Post
    I can't watch the video at the moment, but this alone makes me think it's a u-joint on the driveshaft that has play.
    If it helps, the joints are the Spicer Life type that don't require grease. They have about 3K miles on them, but that doesn't mean one of them hasn't kicked the can already.

  4. #4
    Old Timer DWiggles's Avatar
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    Quote Originally Posted by JKDream View Post
    I can't watch the video at the moment, but this alone makes me think it's a u-joint on the driveshaft that has play.
    No, that's definately not a u-joint. Watch the video. Idk. Nothing to add but I think is has something to do with the transfer case. Yikes, that doesn't seem normal at all!

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    Addict JKbrick's Avatar
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    Is the trans in drive or neutral in this video? Can’t say I’ve ever seen this before


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    When I installed the new driveshaft that came with my mopar kit, they supplied a rubber star washer that went under the new yoke, part# 4210973, maybe it helps lower the vibration from initial shift. ???


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    Quote Originally Posted by JKbrick View Post
    Is the trans in drive or neutral in this video? Can’t say I’ve ever seen this before
    Trans is in neutral the same way you'd typically shift in and out of 4lo. When you hear the sound, it's going from 4lo to 4hi. The sounds is right when it clears the t-case neutral and engages the 4hi gear set

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    Quote Originally Posted by Faulka28 View Post
    When I installed the new driveshaft that came with my mopar kit, they supplied a rubber star washer that went under the new yoke, part# 4210973, maybe it helps lower the vibration from initial shift. ???

    The yoke reused the rubber o-ring that the stock yoke uses and it sits under the nut. That's the norm for most CV installations on a JK. Nothing fancy there, and not really vibration related; more for creating a seal.

  10. #10
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    If I were you, have a helper do the action to make that symptom occur while you are underneath with a stethoscope. I have been working in shops for about 20 years and have never heard something like that. Almost sounds like something is thousands of an inch from touching something else, and that slight movement causes the objects to touch and resonate. Check skid plate clearances also.
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