Well, I got the Crossfire back from a 4 wheel alignment last night. It's amazing, the car is so much better behaved now! I don't know how badly the rear-end was out of alignment before the diff, but it was way out after. The front end was way out too. But its all good now.
Now I think I'm ready to head to the track this weekend. Pray for good weather! It's been raining here for the last week or so.