My truck has been at the dealership for 7 days now, and they are telling me the same thing, that it's normal and the vehicle is functioning as designed. I have contacted a lawyer and if it is not fixed when I get it back I will be filing a formal complaint with GM first, and then with the state Attorney General. Anything that adversely affects the resale value, in the first year and is not fixed within 3 visits or 15 days in the shop, is covered under the lemon law, and must be repaired or bought back by the company... At least in my state. There is no way I would be able to sell my truck for what it's worth with that clunk occurring. And I am not going to just accept that this defect is "normal". GM is going to have a lot to prove to me before I will consider buying another one of their vehicles.