Try these threads: Brake shudder issue Differential Whine, Manual may have a whine Xr6t Diff, Problems Diff Whine, Have you heard it? Blown Diff At 9000klms, self explenitary really Unwanted Diff Whine Diff Clunk, Noisy Diff During Gear Changes Driveline Vibration Driveline Shunt & Diff Clunks, "Sounds Rude" but how bad is it Is the manual really that bad?, Opinions on the XR6 Turbo Manual To mention a few or do a search