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Old 03-05-2013, 01:44 AM   #1
yjderek's Avatar
Join Date: Aug 2012
Location: SE Kansas
Posts: 56
U joints

what are the common signs of a bad U-joint or one that is going bad???

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Old 03-05-2013, 02:49 AM   #2
Join Date: Feb 2013
Location: Indianapolis
Posts: 176
grab it and try to shake it and sometimes you can hear them clicking as they rotate

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Old 03-05-2013, 05:16 AM   #3
Keymo's Avatar
Join Date: Jun 2012
Posts: 10,966
While driving you can hear some clunking/clicking - Like Tylerf83 said... MOst noticable under load.

As for checking on them while parked -

Climb under there and give it a good push and pull in both directions, parallel to the "+" of the U-joint. If your driveshaft moves more than a wiggle, they're going bad. If you get your face right next to the U-joint while you're doing what I said before, you'll also be able to see the "+" moving around in the caps - if they're bad, that is.

You can also always pull your shafts, remove your U-joints and physically check the rollers by removing the caps - but that takes a lot more time.
"The only true wisdom is in knowing you know nothing."
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Old 03-05-2013, 12:10 PM   #4
Join Date: Jan 2010
Location: Las Cruces, NM
Posts: 2,291
Vibration or rumbling sound especially at decel.
(Sold)1994 Jeep Wrangler 2.5L, Bestop top
/w steel half door and slider windows
5 speed, 2.5" lift, 31" tires,rack lights
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Old 03-07-2013, 02:11 PM   #5
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Join Date: Aug 2012
Location: Illinois
Posts: 143
I noticed that mine were going bad just after I lifted my jeep. I replaced the axle u-joints and felt a difference. While driving in 2nd and 3rd I felt a bad vibration from the rear, so i replaced all the drive shaft u joints as well. As soon as I drove it with the new u joints it was a much smoother ride.
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