DOHC V8 introduced in the 1999 model year was replaced by the same 5.4 L 3-valve SOHC V8 that had been available in the F-150 since the 2004 model year. Though having a different head design, the new engine offered similar overall output, producing at 5000 rpm and of torque at 3750 rpm. The new engine was not marketed under the Triton name in the Navigator even though it is mechanically identical to the F-150's engine. The 4R75W 4-speed automatic transmission used from 2003 until 2004 was replaced with a new ZF-sourced 6-speed automatic transmission. The 2005 Navigator's base curb weight fell to while four-wheel drive models dropped to . Towing capacity increased slightly over the previous model year to in two-wheel drive models and in four-wheel drive models. For 2006, an Elite package for the Ultimate trim level was made available, including a DVD-based satellite navigation system with a voice-activated touch screen, THX audio system, rear-seat DVD entertainment system, and HID headlights. Third generation (2007–2017) The Navigator was redesigned under the U326 program code name, with new styling and mechanical features for 2007. Unveiled at the Chicago Auto Show in February 2006, the Navigator featured its most distinctive styling update since its introduction, with new front and rear fascias and side cladding. In front was a split upper and lower chrome grille with integrated fog lights resembling those of classic Lincolns like the 1946-1948 Continental, along with a more complex headlight design and a more prominent "power dome" hood. Elsewhere, an updated rear fascia featured taillights inspired by the Lincoln MKZ and chrome trim was more prominently used along the sides, including chrome lower body molding on the doors. The interior featured an updated dashboard and instrument panel with an extensive use of rectangular shapes, such as in the gauges, as well as greater use of real wood and satin nickel accents. Accompanying the Navigator's redesign for 2007 was a new model, the Navigator L developed under the U418 program code name. Comparable to the Cadillac Escalade ESV, the Navigator L is longer than the standard Navigator on a longer wheelbase, increasing its cargo capacity. The Navigator L was introduced parallel to the Expedition EL, an extended version of the Ford Expedition. Both the Navigator and Expedition were redesigned for 2007 and based on Ford's T1 platform, which is related to the platform of the 2004+ F-150. Compared to