Chevy Blazer

Why 1999 Blazer 4wd vibrating starts at about 20mph get worse to 50mph then quiets down picks up again around 70mph Had tires replaced Eng speed does not effect vibration but worse when accelerating?


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2011-09-13 22:05:36
2011-09-13 22:05:36

could be u-joints or transfer case. gm Jim


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Check the universal joints and balance of the driveshaft. When you are accelerating pressure is applied to these parts and if they are worn or out of balance or dented they will cause a vibration that will stop when you let off the gas.

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Could be several reasons and pretty much the same for any vehicle: -Improper replacement -Bad forward universal joint causing vibration at transmission tail -Unbalanced driveshaft causing vibration at transmission tail -Bad transmission mount Universal joints usually "clunk" when bad Unbalanced driveshafts will cause a vibration when driving - the faster the speed the more the vibration

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