Mine were replaced in '06. First heard rumbling from right rear. Took the car in and told the service rep I thought the bearings were bad. They checked it out and said the differential was causing the noise, and rebuilt it. I drove out of the service area, down the road, and turied around. Problem still there. Took the car back in, took tech for a ride, he heard the noise and they advised me to drive it a week to see it the noise went away since the gears were rebuilt. Took it back the next week, another tech looked at it and blew his stack. Both axles were bad, which should have been caught when the 1st guy pulled them. So, Axles, bearings, rear end all replaced or rebuilt, under warranty! Car had about 85K at the time.