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My 2003 Chevy Avalanche with 210,000 miles has developed a vibration between 70 and 75 mph. I balanced and rotated the tires, however, still have the vibration. The shocks are good and both front hubs have been changed. I am running out of options as what causing this issue. Any suggestions are welcome. I also changed the rear u-joints about 3 years ago.
 

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2000 Silverado Z71 4x4 5.3L 460k+ miles w/ GM rebuilt motor and trans
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2wd? 4wd?

I would look at those U-joints, again. What brand did you replace them with? They're probably the culprit.

If 4wd, then I would look at the front U-joints, as well. Mine are turning 100% of the time my truck is moving, so they wear out without "doing anything". (2000 Silverado)
 

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My 2003 Chevy Avalanche with 210,000 miles has developed a vibration between 70 and 75 mph. I balanced and rotated the tires, however, still have the vibration. The shocks are good and both front hubs have been changed. I am running out of options as what causing this issue. Any suggestions are welcome. I also changed the rear u-joints about 3 years ago.
motor mount. Happend to me the the same way.
 
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