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it would be cheaper, if you lost your key ,to take your vin to cadillac dealer and proof you own it to have them make a key.if you change the cylinder lock youll have to reprogram the antitheft system and possibly breaking the sensor changing the lock and that get pretty pricey. you can get a key made cheap ready to go.cadillacs antithefts are very touchy systems.
Your going to have to buy four 9 point socket and a 5 pound sledge hammer, a breaker bar, a pipe, and 4 new lug nuts. If you lost the key to your anti theft lug nut you can take it to a professional tire repair shop and they can remove the lug nut's for you and hope they have a key that will work. If not there have a tool that can take the lug nut off, with a cost. If your going to try it your self, place the 9 point socket slightly smaller on the lug nut and hammer it on. Be careful not to hurt your self or the car. Once the socket is seized on the lug nut, use the breaker bar and the pipe as an extension for leverage to take the lug nut off. Once off discard the lug nut and socket and do the other three the same way. Good luck and hope this helps.
My 2003 CTS had the same noise problem while on vacation one day. When I returned from the vacation and dropped it off at the Caddy dealership it was revealed that several of the "U" joint nuts had worked themselves loose. A quick fix was to tighten up the "U" Joint bolts and the problem was solved!