Regardless of length or trim level, the 2007 Lincoln Navigator has only one engine, a 5.4-liter V8 with 300 horsepower and 365 lb.-ft. of torque. Power is routed through a six-speed automatic transmission and sent to either the rear or all four wheels, depending on the drive configuration. The suspension is fully independent – a double-wishbone setup in front and a five-link configuration in the rear – and a load-leveling option is available. Four-wheel anti-lock disc brakes and roll stability control with are bundled with AdvanceTrac. Standard 18-inch aluminum wheels are wrapped in 255/70R18 rubber, while the optional chrome 20-inchers roll on low-profile 275/50R20 tires.