13384 - Customer Satisfaction. The rear differential assembly may have been shipped from the supplier with insufficient fluid. Operating the vehicle without sufficient fluid in the rear differential assembly could produce a loud whine and/or gear or bearing noise. Dealers are to inspect the rear differential fluid level and add fluid, if necessary. If fluid is required, dealers are to also road-test the vehicle and listen for rear axle noise. If a whine, gear or bearing noise is present, dealers are to replace the rear differential assembly.
