wow, I'm sure those 37's and dual cases did have something to do with it lol. Was he running stock gear sets or Revo gears? I know a guy running a turbocharged pup with an MUA5 pushing over 300rwhp (not a whole lot honestly but more than we throw at it) and it holds up just fine. Either way ya go they are stronger than the stock 4L30E lol. The world class T5 wasn't all that strong honestly. Start throwing down some real power at em' and you'd blow em' up just like any other T5 in the Camaro's and Mustangs. TKO's all the way on that front! But sticky tires and lots of power will do that. The AR5 is also used in the solstice and the Mallet conversion folks keep it behind there stock LS2 conversions, but they don't recommend drag radials or slicks using it. The AR5 is very similar to the toyota R154