I think what I'm hearing is normal. Hard to tell - you can't even hear it with the sunroof open or a window down. I've heard it before in other trannies meant to handle high HP. I've found several threads that possibly hit on it, though it is hard to tell without hearing others.
I think the "second" noise is what I'm hearing, which a few piped in and said they had:
http://www.camaro5.com/forums/showthread.php?t=349218