I had my front diff replaced a few months back. It didn't completely shatter like Neo's or Bebe's but the tech told me there were some chipped teeth. I was gone while they were working on it so I couldn't check out the damage.
I still don't know exactly how it happened. I didn't even notice it until driving on the highway. Even then I was able to drive it for about a week before taking it in to the dealership.
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