My wife and I just purchased an Acadia last week and during the test drive everything seemed fine. We both loved the car and were quick to buy. But the day after we brought it home I noticed the engine/transmission made a distinct whirring or whining sound whenever you pressed on the gas pedal(almost like it was straining). Also the transmission has quite a bit of lag and will often randomly downshift. We never expected to have these types of issues with a new car. We're going to call the dealer tomorrow, but I just wanted to see if anyone else has had this problem. I did read that the earlier builds had transmission issues but I thought they'd be resolved by now. Thanks for any help.