If you really are using a viper drivetrain you had better look into what transmission will actually fit without a lot of modification. As far as I know, the only T56 (6-speed manual) that will work in an S-chassis without chopping the hell out of it is one from an F-body. I've heard the CTS-V transmission may fit but I don't believe I've actually ever seen it used before.
Honestly, you need to do a lot more research before you start buying stuff. You have a lot more to worry about than what rear end you will use.
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