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Old 03-11-2011, 11:25 AM   #1
Join Date: Aug 2010
Posts: 29
Vibration 35-50 mph

87 4.2L Automatic, Weber Carb, 4" Black diamond Lift, 33" MT tires, 1 1/4 TC drop.

I finally got my jeep running good and everything seemed fine while driving. After a few days i noticed that i was getting a slight vibration around 35 mph. That vibration is now noticably worse. Once i hit 35 the vibration starts but its goes away over 50 mph and feels pretty smooth. I also notice it when I'm slowing down (under 35 mph). I'm thinking its either the tire balance or its the rear drive shaft. No play in the rear drive shaft so I've ruled out u joints for now. Any input?

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Old 03-11-2011, 12:10 PM   #2
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Join Date: Feb 2011
Location: Loveland, CO
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Usually U joints.
I would check the tire balance, it is possible one of the balancing weights came off. If you have curb checked recently the heels may be slightly bent. Double check all the lug nuts while you are at it. Check you tires for uneven wear due to over or under inflation.

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Old 03-11-2011, 12:32 PM   #3
Join Date: Feb 2011
Location: Roseville, OH
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Tires are always the first place to start if there is nothing noticable. You cant look at a titre and tell fi it sout of balance, like you can look at a u joint and tell itsbad.
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