[Wisha Haddan H3]

A lot of people here are hoping to upgrade the aluminum case to the cast iron one from the 08 alpha. The gears are different, but any good shop could set up your old gears in the new case.

I wonder ... since it's all GM, it might not void your warranty either. But if you let a dealership do the work, you'll at least get their standard 1-year on parts.