Question about 1991 GMC C2500

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81 gmc c2500 vibration

I have a 81 gmc c2500 and has vibration at 35 mph and 65mph. can anyone help? put new motor in and also got new universals and the drive shaft balanced

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Sounds like a bad u joint,they will have a vibration frequency that makes them vibrate at different road speeds

Posted on May 18, 2008

  • blaze9000 May 15, 2011

    I have had a vibration problem caused by a worn transmission slip yoke bushing. See if you can move the front slip yoke/ u-joint side to side.

    It might be a tire worn out of round. All terrain tires need to be ballanced more often to keep them from wearing out of round, which ruins the tire.

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