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Unread 04-01-2010, 06:01 PM   #1
jerzeygrinch
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1992 YJ Wrangler 
 
Join Date: Feb 2010
Location: Virginia
Posts: 15
YJ shaking while accelrating

Today my stock 92 YJ started shaking bad, like I was driving over rumble strips while accelrating in 2nd, 3rd, 4th gear. Never got to 5th because I didint want to go any faster. Any ideas whats going on?

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Unread 04-01-2010, 06:11 PM   #2
jay-h
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1989 YJ Wrangler 
 
Join Date: Dec 2006
Location: , NJ
Posts: 4,508
U-joints or motor/transmission mounts
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Unread 04-01-2010, 06:50 PM   #3
cbmadcow
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1993 YJ Wrangler 
 
Join Date: Nov 2005
Location: New Bedford, Massachusetts
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Check the u-joints.
I just replace my rear u-joint this past weekend. Exact same symptom driving down the highway feeling this very nasty vibration starting at about 50mph. It's an easy repair as long as the u-joints come out easy.

Kevin
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Unread 04-01-2010, 08:39 PM   #4
jaminb
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1999 TJ Wrangler 
 
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Location: Canton, MI
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also check the play of the slip yoke ( the output of the t case). if it moves around this will more likely be the cause of your vibration than u joints. You joints would not vibrate that bad through all those gears, they would eventually reach a point where they would even off.
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Unread 04-02-2010, 08:55 PM   #5
jerzeygrinch
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1992 YJ Wrangler 
 
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Location: Virginia
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Quote:
Originally Posted by jaminb View Post
also check the play of the slip yoke ( the output of the t case). if it moves around this will more likely be the cause of your vibration than u joints. You joints would not vibrate that bad through all those gears, they would eventually reach a point where they would even off.
I was told it was the yoke in the pumpkin rear end that was bad but I dont believe them. He showed me the inside and as the wheel was turned the piece in the middle he called the yoke spit some oil out as it turned and this was the problem?? Also said the rear end needed to be rebuilt!! Gonna tell them to put it back together and I'll limp it home and look for other opinions. Thoughts???
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Unread 04-02-2010, 09:31 PM   #6
fallenbirdbeak
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1990 YJ Wrangler 
 
Join Date: Apr 2010
Location: Los Angeles
Posts: 31
It's the U-joints. I doubt it is the motor mounts, but you never know. Check the U-joints first.

This happened to mine before they broke and my rear drive shaft was hanging from the rear of my Jeep like a damn ****.

My 4wd did not work at the time, so I had to get towed like a btch.
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Unread 04-02-2010, 11:05 PM   #7
jaminb
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1999 TJ Wrangler 
 
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Location: Canton, MI
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It is possible that they input yoke on the rear differential is bad and moving around causing your vibrations. But checks these in order first...

1. U joints. ( move the drive shaft around by hand and see if you can see the joints moving)
2. Check for play in the slip yoke. ( it should NOT be able to move up and down noticably)
3. Check your motor mounts and trans mission mount as well at the torque pin. ( torque pin is the little nipple looking thing that sticks out from under the t case skid plate)
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Unread 04-02-2010, 11:31 PM   #8
MJMPC
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1991 YJ Wrangler 
 
Join Date: Nov 2008
Location: Elizabethtown, Ky.
Posts: 3,070
Check your air pressure in your tires and then rotate them. Had a truck do that once.
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