[HotRodSaint]

According to the above website, they use an S10 manual transmission but I was thinking that a Vette 6-speed would be stronger and better. GM people I have corresponded with online all have told me the Vette mission will bolt on. Even if they are mistaken, the S10 mission will work fine.

GM people should know that the Corvette tranny is mounted in the rear. You might want to think about using a Camaro 6speed tranny instead. In fact, it would be easier and cheaper to buy a Camaro/Trans Am drive train. Since the Catera was never made at a Cadillac factory anyway, you'd be keeping real buy using parts bin stuff just like GM did.