The 2003 model year had a different ground clearance spec for GT & non-GT versions. It says the GT is approx. .2 inches lower; I would guess that the springs are 1 inch lower, but with the 17 inch wheels, the height is raised up again, offsetting the lowering to some degree (?). Regardless, I think there should be a minimal difference.
See this link:
http://www.new-cars.com/2003/chrysle...ser-specs.html