bigDee

I have a 2014 z71 that was bought back by Chevrolet as they claimed to fix the vibration I still have. I purchased knowing it had been an issue at 50 mph, but I was told the problem had been resolved. I know the dealer I bought it from but would be more comfortable bringing it to another dealer to look at. Any thoughts on this process? I did sign an acknowledgementioned that I was made aware of the issue and that another year was added to warranty. thanks. I did pay far less than market UT just want the vibration to go away