I'd check ball joints, tie rods, sway bar links and strut mount. On my 00 GT when I had this noise it was a combo of the ball joint and the control arm bushings. Just replaced the entire unit with the Dorman one (since it comes with a new ball joint) and it's been quiet ever since.

Since I don't know what year you have, then you could also check the sway bar itself, as the 97-03's are known to crack right around the link.