Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
if the rumbling noise changes tone or stops during hard cornering, then this would point to either the wheel bearing being worn or the gears themselves
I'd say a worn bearing is more likely and this is replaced as an entire unit
and I'd say that for the noise / vibration to dissapear in 4WD modes its likley that the drive load is taking up the slack and seating the bearing
a new hub unit is about $50 and I'd work on a garage needing 2 hours to replace it
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