Driveshaft Grinding -
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post #1 of 4 Old 04-08-2010, 10:43 AM Thread Starter
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1995 YJ Wrangler 
Join Date: May 2006
Posts: 79
Driveshaft Grinding

Hi there -

I was driving on the highway yesterday when all of a sudden the Jeep started vibrating and making a horrible grinding noise. I made it back home and checked underneath and this is what I found where the slip yoke connects to the rear drive shaft:

What do you think could be the cause of this? U-joint failure? they seem ok but I'm no mechanic so I could be missing something. I have a 1.5" lift on the Jeep, and although it came with a transfer-case drop kit I never installed it and haven't had a problem for the two years the lift has been on. Does the drive shaft angle look too extreme? I'm thinking about installing the transfer-case drop kit just to be on the safe side. I'll definitely have to replace the slip yoke and U-joints, just not sure what else needs to be done to keep this from happening all over again.

Thanks for your input guys

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post #2 of 4 Old 04-08-2010, 10:45 AM
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1997 TJ Wrangler 
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Location: Essex
Posts: 4,372
Just replace the ujoint and see if it helps.

1997 TJ with some stuff done to it.
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post #3 of 4 Old 04-08-2010, 12:02 PM
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1993 YJ Wrangler 
Join Date: Aug 2008
Location: Raleigh
Posts: 11,204
Yep looks like the u-joint needle bearings have wore out and the whole joint has shifted causing it to bind.


I have a jeep...and it is modified...I win.

YJOTM July 2012
YJOTM February 2014

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post #4 of 4 Old 04-08-2010, 12:40 PM
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1993 YJ Wrangler 
Join Date: Mar 2010
Location: minnesota
Posts: 163
Just looks like a massive u-joint failure. It happens on occasion. Sometimes the cross will break and the driveshaft will just flop around and smash the floorpan. I doubt that the small lift is compromising your driveshaft angles. Did you notice any vibration prior to the failure? If you did you can always lower the Tcase an inch to alleviate that. If not, just replace the slip yoke and u-joint and chock it up to mechanical failure. If the wear on the driveshaft is too severe, you may want to replace the whole thing. It can easily be thrown out of balance causing vibration and premature failure in the future.

Last edited by djsmith1174; 04-08-2010 at 01:40 PM.
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