Two years ago my 05 started making noises and I was told I had to replace my rear differential. At that time the Toyota service advisor told me to drive it till it dropped. Not knowing much about it I have just kept driving. Then as the noise got worse I started asking questions and got 2 different assessments and they all came to the same conclusion. Though everyone was very surprised that a 4 runner that was only 8 years old had to have a rear differential replaced. Has anyone had similar bad luck? Does this sound out of the ordinary? I have talked to my Toyota Dealership but they are basically ignoring me.