I have a 2014 Silverado bought new Dec 2014. The rear end sounds like it is falling out when the truck is slowing down. Grinding chattering noises. It was quite until the truck reached 1400 miles. The truck has already been to the dealer for a vibration when over 65mph. I am questioning whether I made the correct decision buying a Chevrolet? I have owned new chevy trucks since 1982 but his takes the cake. two trips to the dealer in under 27 days. jeff