The Town Car was extensively re-engineered for the 2003 model year with a new frame, a new rack-and-pinion steering system, a new brake system, and new front and rear suspensions. This resulted in improved handling. Revised front and rear styling distinguished the changes, but the styling revisions were subtle.
Changes have been minimal since then. The 2006 model features new aluminum wheels at every trim level, plus new colors inside and out.