another option would be to get the rear end from a manual car. It comes with 3.27 gears, but it has an LSD, which makes driving so much better.
The V uses the E-diff that comes with the SS 1LE camaro, CTS-V, CTS V-Sport and ZL1.Sadly the 3.73 from the V will not communicate, something about a built in pump or cooler or something.
Turns out Overkill has a supercharger kit for these models so....time to start saving ; )
Thanks for all the input.