There’s no question that the 2007 Lincoln Navigator is significantly improved compared to its predecessors. Its 5.4-liter Triton V8 makes enough power for everyday driving, but not enough to generate any excitement. Its six-speed transmission has been engineered for faster acceleration, smaller steps between gears and improved shift quality. Both fifth and sixth gears are overdrive to help increase fuel economy, and the transmission also locks to assist with towing duties. The four-wheel drive system is a true off-road style, with a transfer case and locking differential that, despite the ruggedness, is more likely to be used when towing and hauling loads on slick and gravel surfaces than in real off-roading.