Hey, I don't want to highjack your thread, but I have the same problem on my 04 GT. I have about 56,000 miles on it and get the same "creaking" sound at low speeds. But my car also makes this sound over speed bumps, even at really low speeds and it also makes a clunk on slow turns, most noticeable when exiting driveways. My car is completely stock, except for aftermarket wheels and tires. I had the differential oil changed but that did not help the problem at all. Any input as to where to begin would be appreciated.