Vibration at 35mph-40mph -
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Unread 10-10-2013, 03:56 AM   #1
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Vibration at 35mph-40mph

Hey Guys,
Took my 87 YJ out wheeling last weekend and on my way into work the next day I found I had a not so fun vibration at 35mph. The whole jeep isn't really vibrating, but the dash is and making a lot of racket. I crawled underneath and poked around, looks like my u joints are ok, no shiny spots on my rims anywhere, but there's some play (not rotational) from my drive shaft as it leaves the t case. Is that normal? Do I just need to replace the bushings/bearings there? There’s no lift, just 30” tires.

My passenger front wheel bearing needs to be replaced as well, but that's been that way for a while so I don't really think that's what is causing the vibration (parts are on their way).

Thanks for any insight!

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Unread 10-10-2013, 10:18 AM   #2
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1987 YJ Wrangler 
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thats an odd speed to have a vibe at. mine started doing it at 30mph when i lifted it the other day so i would check that driveshaft again, maybe that movement is a no-go?
Slow ride, take it easy
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Unread 10-10-2013, 10:26 AM   #3
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1992 YJ Wrangler 
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Play side to side is not normal for the driveshaft. I'm assuming your talking play at the rear u joint/yoke and not the output shaft, although side to side play at the output shaft is not good either?
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Unread 10-10-2013, 11:58 AM   #4
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This is play at the output shaft, before the u joints. It's not much play, but enough to wiggle a little. Is there a bearing in there that could be failing that would cause it?
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Unread 10-10-2013, 01:22 PM   #5
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1988 YJ Wrangler 
Join Date: Jun 2013
Location: Whittier, CA
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Check your wheels for mud. It's a long shot, but I have personally experienced that, and you did just go out wheeling before it started. Check for missing wheel weights too.
Dodge did not build my Jeep.
1988 Wrangler,4.2L I-6, Howell EFI JP-1, 5 Speed Peugeot, Zone 2.5" lift + 1/2" booms, BFG 31 x 10.5, Bestop.
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Unread 10-10-2013, 01:30 PM   #6
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Haha, no mud out here. Checked for shiny spots on the wheels, didn't see anything.
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