Class-exclusive power running boards and a new power liftgate highlighted the 2003 redesign of Lincoln's full-size sport-utility vehicle. Essentially, the Navigator is a Ford Expedition luxury spinoff. Dimensions changed little, but styling was revised. Introduction of an independent rear suspension lowered the rear floor by 9 inches, to provide more third-row leg room. Navigator's new dashboard design was not shared with the Expedition. Luxury, Premium, and top-line Ultimate models were offered, all equipped with a 300-horsepower, 5.4-liter V8, versus the 260-hp engine in the Expedition. A four-speed automatic was the sole transmission. Navigators were offered with rear-wheel drive or Ford's ControlTrac four-wheel drive, which could be left engaged on dry pavement and included low-range gearing. Antilock four-wheel disc brakes, 18-inch wheels (versus 17s in 2002), power-adjustable pedals, leather upholstery, and genuine walnut interior trim were standard. So were curtain side airbags that served the first and second seating rows, and were designed to deploy in side impacts and rollovers. Torso side airbags were unavailable. Heated power-folding door mirrors and an in-dash CD changer also were standard. A self-leveling air-spring suspension was included with 4WD. Second-row seating was a choice of two buckets with a center console, or a three-passenger split-folding bench. A 60/40 split folding third-row bench was standard. The Premium model featured traction/antiskid control and heated/cooled front seats. The Ultimate added a power-fold feature for each section, which was also available for the Expedition. However, no other SUV offered the Navigator Ultimate's standard power liftgate or power running boards. The latter automatically extended when a side door opened, and retracted when it closed. Premium and Ultimate options included rear-seat DVD entertainment and a navigation system. Later in the year, a tire-pressure monitor became available. Rivals included the Acura MDX, Cadillac Escalade, Mercedes-Benz M-Class, and Toyota Land Cruiser.