quote:My guess is that you have broken the spot welds on the bolt heads inside the cross member and the whole assembly is turning...
As soon as I read your suggestion, I ran to the garage with a open wrench (instead of a ratchet) and backed off the nuts waiting for the stud to spin........nutin.....Damn!
Well, you obviously haven't broken the spot welds. Get a nut splitter to properly remove the nut before you destroy or cross-thread the remaining threads on the stud.

http://www.amazon.com/Nut-Spli...-Piece/dp/B0000AX88Q
You could probably find them cheaper elswhere - Google is your friend.