I made it over 500 miles with my new clutch so I figured what better way to test the grip than to do alittle burnout launch. Grip was good and the air smokey but down the road I noticed when I let of the gas I heard a humming from behind me and when I pushed the clutch in it was a bit louder. Since my back seats are out I can tell its %90 something w/ the rear(%10 error). Now my question is what do these symptoms point towards?? My car is a 86.5 w/ 239,000 on it and a 4.3 rear.