shutter at take off
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if you have a 2 peice drive shaft, its most likely the carrier bearing that supports the drive shaft, mine was doing the same thing. comeing from a stop light taking off it would shudder especailly when i got on it. doubtfully a rotor. unless its so bad its grabbing while driving, but im sure you would notice that alot more. an a rear end shutter, maybe, but you would feel that more on cornering. hope this helps.