...no. I believe it's still a Tremec model, but beefed up from the normal one. Lemme check.....
EDIT:
http://media.gm.com/us/powertrain/en...2008/08car.htm
I love this site to death (^).
The Z06 does have a Tremec, like I thought. However, the gearing is altered and slightly less aggressive from the standard unit. (Do they call lower ratios 'shorter' gears?). It's also beefed up and rated for a higher torque input.