My tranny builder (http://www.phoenixtrans.com/) talked me into changing out my 3.08 gears in my 10 bolt and replace them with 3.73. for a better ride.
You might like to know the 2002 Firebird disc brakes will bolt up to the 10 bolt without any mods.
I have bought two sets of gears on line at EBay. You will find plenty there and at a reasonable price.


~Jim