Welll when I was at the track I heard something pop but it was a relatively low rumble but It drove home fine sounded like rear end whine, I just changed the spark plugs because the gap was gone on of them and was skippin... After I did that I started feeling vibration in the car so I thought the car was still skippin so I got on it in first gear and something let go, I think its in the pumpkin because the car still moves. Everytime I'd shift I would hear something in the rear end. damnit