The rear differential failed and had to be rebuilt. This included replacing the following parts plus the labor cost to install them. Pinion - 5R3Z4215AA Washers - 4L5Z4228BA Shaft - D8BZ4211A Spacer kit - 8R3Z4C121A Flange - 5R3Z4851DA Ring gear - 8R3Z4209J Washer - D5AZ4670A Bearing - B7A4621A Cup - DV6Z4222A Bearings - DV6Z4221A Seals - 5R3Z1A177AA Bearings - E3TZ1225AA 75-140 Synthetic Gear Oil Additive Shim kit

Operating vehicle on clear day, traveling on highway in 5th gear and not increasing speed. Heard loud noise that was originally thought to be a flat tire. Upon inspection, all tires were fine. Noise became louder when driving and accompanied by clanking metal sound and smell of burning rubber. Had vehicle towed to mechanic who advised that the rear gears had separated from the housing and destroyed the entire rear differential. The cause of this issue is still unknown.