Chevrolet, GMC Shudder or Shaking

Chevrolet, GMC Shudder or Shaking Chevrolet, GMC shudder or shaking when your driving down the road at a steady or slight acceleration.  This usually happens around 25 to 80 miles per hour.  What is it?  Several things could be the cause like tire balance or wheel balance.  Those issues though...

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