I've got an Auburn Pro Series rear end in my car. It's been working great & trouble free since it's installation, which is going on 5 years.
Am very happy with it!
Another local buick member Scooby Doo has one in his car too. His car spends lots of time launching hard at the drag strip. Although I can't speak for him, I'm not aware of any issues.
Maybe he will chime in?