Drivetrain has a slight whine noise at 40 and 80 mph when decelerating. Differential was inspected and looked normal. Problem still occurring will be returning to dealer soon.
5600 mi
Whine in rear differential. Differential replaced. Low speed whine is mostly corrected but high speed whine remains. ECM reprogramed for better transmission response.
17300 mi
The M80 rear differential started wining and clunking going from reverse to drive.
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