Started getting a very rough, low vibration that can best be described like when you shift in to a higher gear too soon. I can't tell if it is the clutch or bearings. Happens worst between 25-40 mph, isn't as bad with gear disengaged or clutch pressed. Very bad when accelerating. Only 58k miles. Need to change my sig because I have bfg AT's now, not MT's. Up until 2 weeks ago I never felt this before.