The Lincoln Navigator II, specifically the 5.4i V8 24V (300 Hp) 4×4 Automatic variant, represents a significant iteration in Lincoln’s full-size SUV offerings. Produced from 2005 to 2006, this model year falls within the second generation (2003-2006) of the Navigator, which was based on the Ford U246 platform shared with the Ford Expedition. This generation marked a substantial upgrade in refinement, interior space, and available features compared to its predecessor, aiming to compete directly with luxury SUVs from Cadillac, Lexus, and Mercedes-Benz. The 5.4i trim, positioned as a mid-to-high range offering, provided a balance of power, capability, and luxury features for the American market.
Technical Specifications
| Brand | Lincoln |
| Model | Navigator |
| Generation | Navigator II |
| Type (Engine) | 5.4i V8 24V (300 Hp) 4×4 Automatic |
| Start of production | 2005 |
| End of production | 2006 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV |
| Seats | 8 |
| Doors | 5 |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 8.8 kg/Hp, 113.2 Hp/tonne |
| Weight-to-torque ratio | 5.4 kg/Nm, 186.8 Nm/tonne |
| Power | 300 Hp @ 5000 rpm |
| Power per litre | 55.5 Hp/l |
| Torque | 495 Nm @ 3750 rpm, 365.09 lb.-ft. @ 3750 rpm |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | Triton / T54USEM |
| Engine displacement | 5408 cm3, 330.02 cu. in. |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 90.2 mm, 3.55 in. |
| Piston Stroke | 105.8 mm, 4.17 in. |
| Compression ratio | 9.5:1 |
| Number of valves per cylinder | 3 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | SOHC |
| Engine oil capacity | 5.7 l, 6.02 US qt | 5.02 UK qt |
| Coolant | 18.4 l, 19.44 US qt | 16.19 UK qt |
| Kerb Weight | 2650 kg, 5842.25 lbs |
| Max. weight | 3380 kg, 7451.62 lbs |
| Max load | 730 kg, 1609.37 lbs |
| Trunk (boot) space – minimum | 518 l, 18.29 cu. ft. |
| Trunk (boot) space – maximum | 2968 l, 104.81 cu. ft. |
| Fuel tank capacity | 106 l, 28 US gal | 23.32 UK gal |
| Length | 5232 mm, 205.98 in. |
| Width | 2000 mm, 78.74 in. |
| Width with mirrors folded | 2029 mm, 79.88 in. |
| Width including mirrors | 2088 mm, 82.2 in. |
| Height | 1975 mm, 77.76 in. |
| Wheelbase | 3018 mm, 118.82 in. |
| Front track | 1701 mm, 66.97 in. |
| Rear (Back) track | 1704 mm, 67.09 in. |
| Ride height (ground clearance) | 241 mm, 9.49 in. |
| Drag coefficient (Cd) | 0.41 |
| Minimum turning circle (turning diameter) | 11.8 m, 38.71 ft. |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 6 gears, automatic transmission |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Hydraulic Steering |
| Tires size | 255/70 R18 |
| Wheel rims size | 18 |
Powertrain & Engine Architecture
The heart of the 2005-2006 Lincoln Navigator II 5.4i is the Ford Triton 5.4-liter V8 engine, designated with the code T54USEM. This engine is a three-valve-per-cylinder (24V) design, a significant improvement over the earlier two-valve versions. The Triton engine family was a mainstay of Ford’s truck and SUV lineup for many years, known for its robust construction and relatively simple maintenance. The 5.4L engine utilizes a cast iron block with aluminum cylinder heads. Fuel delivery is managed by a multi-port fuel injection system, providing precise fuel metering for optimal combustion. The engine’s 9.5:1 compression ratio contributes to its power output. The Navigator II paired this engine exclusively with a 6-speed automatic transmission (model 6R75E). This transmission offered smoother shifts and improved fuel economy compared to the 4-speed automatics found in earlier Navigators. The 6R75E is a robust unit, designed to handle the substantial torque output of the 5.4L Triton engine.
Driving Characteristics
The 300 horsepower and 495 lb-ft of torque delivered by the 5.4L V8 and 6-speed automatic combination provided the Navigator II with ample power for towing, hauling, and everyday driving. While not a sports car, the Navigator II offered brisk acceleration, especially considering its substantial weight. The automatic transmission’s gear ratios were tuned for a balance of performance and fuel efficiency. Lower gears provided strong off-the-line acceleration, while higher gears allowed for relaxed cruising on the highway. Compared to the higher-output 5.4L engines found in some Ford F-150 trucks, the Navigator’s tuning prioritized smoothness and refinement over outright power. The 4×4 system provided enhanced traction in inclement weather and off-road conditions, making it a capable all-weather vehicle.
Equipment & Trim Levels
The 5.4i trim of the Navigator II came standard with a generous array of features, including leather upholstery, power-adjustable front seats with memory function, a premium audio system, tri-zone automatic climate control, and rear-seat entertainment system. Optional extras included power-folding running boards, a navigation system, and upgraded interior trim packages. The Navigator II’s interior was designed to provide a luxurious and comfortable experience for both the driver and passengers. The spacious cabin offered ample legroom and headroom in all three rows of seating.
Chassis & Braking
The Navigator II utilized a body-on-frame construction, providing a robust and durable platform. The suspension system consisted of independent front suspension with coil springs and a solid rear axle with leaf springs. This setup provided a comfortable ride quality, although it wasn’t as refined as the independent rear suspension found in some competing SUVs. Braking duties were handled by ventilated disc brakes on all four wheels, coupled with an Anti-lock Braking System (ABS) for enhanced safety. The Navigator II’s braking performance was adequate for its weight class, providing confident stopping power in most driving situations.
Market Reception & Comparison
The 2005-2006 Lincoln Navigator II 5.4i was generally well-received by critics and consumers. It was praised for its spacious interior, comfortable ride, and powerful engine. However, some reviewers noted that its fuel economy was relatively poor compared to some of its competitors. Compared to the base Navigator with the smaller 4.6L V8, the 5.4i offered significantly more power and torque, making it a better choice for those who frequently tow or haul heavy loads. Compared to the Cadillac Escalade and Lexus LX 470, the Navigator II offered a competitive level of luxury and features at a slightly lower price point.
Legacy
The 5.4L Triton V8 engine, while generally reliable, is known to have some potential issues, including spark plug breakage and timing chain wear. Regular maintenance, including oil changes and spark plug replacement, is crucial to ensure the longevity of this engine. The 6R75E automatic transmission is also generally reliable, but it can be susceptible to overheating if subjected to heavy towing or prolonged use in demanding conditions. Today, the 2005-2006 Lincoln Navigator II 5.4i can be found on the used car market at relatively affordable prices. It remains a popular choice for those seeking a large, capable, and comfortable SUV. Its robust construction and powerful engine make it a suitable vehicle for families, commuters, and those who need to tow or haul heavy loads.
