Revised styling, underskin mechanical changes, and the midyear availability of a navigation system highlight the 2003 revamp of the lone American-brand rear-wheel-drive full-size luxury sedan. Town Car ascends through Executive, Signature, and Cartier trim levels, topped by a limousinelike Cartier L that adds six inches to the wheelbase. All retain a 4.6-liter V8, which gains 14 hp this year. A 4-speed automatic is the sole transmission. Traction control is standard, but no antiskid system is offered. New for '03 is a revamped frame and suspension, different steering system, and standard 17-inch tires vs. 16s. Brakes are antilock 4-wheel discs, now with full-power assist. In addition to reworked front and rear sheetmetal, Town Car has a restyled dashboard with a dual-zone climate system and CD/cassette audio. Front side airbags are new and standard, but rear airbags or curtain side airbags are unavailable. Power-adjustable pedals, leather upholstery, and a front bench seat are standard. A rear-obstacle-detection system is optional on Executive, standard elsewhere. High-intensity headlamps and the new navigation system are available on all but the Executive. With the advent of the navigation system, Lincoln dropped its formerly optional Vehicle Communications System.