Congrats on your car! You'll find a bunch of us here that are very happy with the CR car, and have possibly already dealt with issues as you come across them.
In even better news, this is also where you'll be able to get outstanding advice on any technical question you've got about your car, by either browsing the archives of, or posting on the CR forum.
Best news of all (IMHO) is that Don Scott (aided and abetted by DV) is now in charge of what was Classic Roadsters (now ClassicRoadsters
2)!
As for your rear-end question, I'm guessing since you found the CR forum, you've seen the recent post about just that
subject. If you've got a digital camera and can post pics, you may even get specific answers about making sure what you've got is bolted together as it should be.
JLW
(just another happy CR owner)