I have a 2013 V coupe and noticed a vibration under car. I recently put a brand new diff in it and picked car up and there was still a small vibration but other symptoms stopped... it is slowly getting worse and I'm certain it's not the new diff. It's hard to pinpoint..but sounds more from the front. Wheel bearing were all checked a little while ago...no play in the wheels at 12 and 6...some at 9 and 3. I'm not experiencing any slip or bogging so I dunno if it's torque converter.... I'm lost really. What's next? Tires...alignment?