Get it to the dealer.
There are problems with some of the new Tremec 6 speeds.
It is affecting Challengers and Camaros (and Mustangs, I heard?)
GM has deemed the problem so bad that shipment of new 6 speed SSs has been temporarily suspended, and many cars have been recalled.
I've even heard (on this forum) of one zero mile SRT making crunching noises from the tranny while being unloaded from the trailer at the dealership.
The dealers are, no doubt, already aware of this. Will probably just replace the tranny under warranty, and be done with it.
Good luck. Please keep us posted.
'09 Stone White R/T
Gone to its new home.