Its substantial rims wrapped in 255/75R17 tires do their part in assisting the large SUV to handle all but the most curvaceous roadways with reasonable composure, but the ride is noticeably harsh when enduring uneven pavement such as driveway curbs or speed bumps. Speaking of driveways its oversize width and length would normally make parking a chore, but the Navigator's parking assist, that beeps separate tones front and rear when objects come into close proximity, puts the mind at ease. The auto leveling suspension helps keep a fairly consistent contact patch between the four tires and pavement underneath, improving its independent front and live axle rear suspension performance while hauling heavy cargo or towing - it's capable of up to 3,401 kg (7,498 lb) of trailer by the way.Most of the towing credit is due to the powerful 300-hp, 32-valve V8's 355 lb-ft of torque. Despite its hefty 2,595 kg (5,721 lb) curb weight, the Navigator pulls away from a stoplight with an eager athleticism, but unfortunately almost goes through an Exxon tanker load of fuel in the process. If driven more conservatively, expect fuel economy closer to 20.5 L/100 km city and 13.7 L/100 km highway. A fuel efficient diesel would probably be a welcome addition.
Power gets to the wheels via a 4-speed automatic transmission mated to 4WD. A button on the dash allows either 4-HI or 4-LOW gearing, the latter set to a higher gear ratio than most true 4x4's. Just the same, its 216 mm (8.5 in) ground clearance should make coaxing it through mud, snow and medium duty dirt roads a cakewalk.