Yesterday I had to take my car in for a shudder in the trans 40 to 65 mph.
The assistant service manager after keeping my car all day said the mechanic still was trying to figure out what to do. So he took me back to the mechanic. He told me he had test drove the car and did feel the shudder. I told him that on the Camaro forums that there were other owners having these issues. It seemed most were getting the flush and replace the torq converter. He said the flush wait 200 miles and then if that doesn't work replace the converter. So I went back out so I could get a rental and the Service manager was saying that the flush may not be covered under warranty. I told him that it should be for you have to flush before changing the torq converter. We will see what happens. I also sent a private message to customer care for support. I hope they can fix it.