Check diff oil level, if constant with road speed possible wheel bearing, if you can alter the pitch of the noise with throttle position this is a noisy diff, also get drive line uni's checked as well.
Mark (mhpautos)
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Saturday, January 1st, 2011 AT 3:41 AM
JIM AUGUSTINE
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Check oil in differential, if low, add very HIGH quality lube w/inert additive(recommended)this will coat gears and stop noise(if not too bad)Remember always check all fluids and grease as needed or more! Does your car have a carrier berring?