[767Jockey]

John,
You mean the main pinion to yoke nut? Boy, if you drove it long enough to make it bind up and sieze like that in a brand new car, I sure wouldn't take the chance. I'd be looking for a whole new differential assembly. Even if you get it to work now, what's going to happen 5000 or so miles down the road when you're on your own with no one to foot the bill but yourself? It sucks for now because you're understandably eager to get the car going, but in the long term you're almost certainly better off to get another new one now while it's covered. Good luck.