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I have a 2001 GMC sierra 1500 4x4 5.3l when accelerating there is a vibration that I can feel in the floor. Does not make vibration on de-acceleration. also does this when accelerating while turning. I thought it was coming from the front end but everything is tight so I am wondering if it is something in the rear end and is sending vibrations through the drive shaft where I can feel it in the floor. Any comments or advice would be appreciated thank you.
I would check for a bad u-joint first.