Question about 1999 GMC Suburban

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Loud roar or vibration

On my 99 4WD GMC Suburban, I have a loud roar/vibration at 55 to 65 MPH. The vibration is constant and will not fade or change pitch when decelling or cornering or any other attempt to change the frequency. What is the most likely cause?

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  • pitt6 Dec 29, 2008

    I have the same problem, I had the transfer case gone thru the rear end bearings and gears replace, the front bearings replaced, new tires, new ujoints, new rear drive shaft, had both drive shafts balanced, and the noise is still there.

  • seibold May 02, 2009

    I have this same vibration. 54mph to 67mph. So far we've tried: new wheels, new tures, new u-joints, new pitman arms, new streering box, new bearings and new re-built rear end. Same problem exists. Has anyone, ever fixed this problem?
    99 GMC Suburban



2 Answers

Check your u-joints

Posted on Aug 23, 2008

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Start by inspecting your tires. Look for uneven tread ware, tire separation (a bubble) on the inside or outside. Then change the fluid in your front and rear differential. This will tell you if you have a gear problem. Change the fluid in your transfer case also for indication of a gear problem.

Posted on Jul 10, 2008


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