Ok I generally dont like say much about how fast I go, due to street racing issues and stuff, but at this point I really don't care anymore do to new car coming out. Some people on here already have a good idea though.
I run in the 10's on horsepower and then spray it. I have yet to have any problems with my posi unit! Now I do aspect to start, thats why I am looking at going with a Full spool. I don't know much of any one that runs any Posi unit in a deep 9 sec car with out any consequences. So for someone that is looking for a Auburn Pro for there street car should have no problems for long time. Just use good oil. But like anything else, if you misuse it,... nothing will last. I am sure I don't have to elabrate on mis-use either. Just make sure your oil is clean and set-up right. As goes for Stang Racer 20...being that your instructors have Mopars and most likly a Dana rear-end...maybe Auburn has issues for those rear-ends?
As goes for the Fords with the 8.8,7.5 & the 8 inch I honestly don't think there is any problems. Now I am sure that with all the carriers they put out every day that sooner or later someone will have a bad one...but most people don't.
My .02's