Contacted BBB last week. Then next day GM calls wanting to know what they could do to help. 1 week later, Gm calls back and nothing they can do "it is at factory specs". Same as before. NO HELP! now I can not get the BBB to call me back to discuss the next step. I have called different times of the day, left messages and still have not received a call back. I guess I will need to contact a Lawyer at this point. Truck is still vibrating at 45-60 and I can not get anyone to look at it or work on it. Shame that I have to fight so hard to get something to work the way it is suppose to. Pay good money for a piece of JUNK.