Question about 1999 Chevrolet Blazer

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Shimmy dry road makes humming noise and shakes all speeds gets worse above 70 in 2wd but when put into 4whl auto goes away and starts shim in decrease of speed

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  • crutchfield3 Jan 04, 2009

    no not to my knowledge has 117000 looks like used for towing has a hitch and air shocks ive had for wo months changed shocks everthing on vehicle clean or new looking

  • dwkcool May 11, 2010

    have the front hub bearings checked

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Check uni joints

Posted on Jan 05, 2009


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Having a problem with the rearend its making a humming noise when driving down the road it goes away when u push the gas and comes back when u take foot off and i already changed all the gears inside ??


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Bearings or cv joint?


Wheel bearings.
For quickly ruling out the CV Joint, in a parking lot, turn one way in a sharp circle, then the other way circle sharply. A clicking sound is indicative of a bad c/v joint or 1/2 shaft.
Humming while in motion (most of times it will only occur during a specific speed range - over a certain speed goes away) says a wheel bearing is shot.
Normally you should replace both at the same time... however you can check with a laser temp gauge each front hub after driving. The hotter one is bad - or a less scientific approach is to swerve going down the road. and listen for an decrease in noise going in one diretcion over the other.
If you are turning the steering wheel right, and the noise goes away, the right bearing is bad and vice versa.

Thanks for using FixYa - a FixYa rating is appreciated for taking the time to answer your free question.

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Thumping at front passenger wheel area


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