[Tom '74 911]

I don't mean to be snarky, but if you are really attempting to swap a 996 transmission into an '82 911 SC, my guess is that working out the CV joints and axles is going to be the least of your worries...

For reasons that should be fairly obvious, this is not a straight-up swap.

I think we need more information... maybe I misread the description of your project & question?

Tom