The GMC Yukon II (GMT800) 1500, equipped with the 6.0-liter V8 engine producing 320 horsepower and a four-speed automatic transmission with four-wheel drive, was a prominent full-size SUV produced from 2001 to 2006. Positioned as a robust and capable vehicle within the Yukon lineup, this variant catered to buyers needing substantial towing capacity and all-weather capability. It represented a key offering in GMC’s strategy to compete with the Ford Expedition and Chevrolet Tahoe, offering a blend of truck-based durability and family-oriented space. The GMT800 platform, shared with the Chevrolet Tahoe and Cadillac Escalade, marked a significant step forward in interior refinement and ride quality for the full-size SUV segment.
Technical Specifications
| Brand | GMC |
| Model | Yukon |
| Generation | Yukon II (GMT800) |
| Type | 1500 6.0 V8 (320 Hp) 4WD Automatic |
| Start of production | 2001 |
| End of production | 2006 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV |
| Seats | 8 |
| Doors | 5 |
| Fuel consumption (urban) | 19.6 l/100 km (12 US mpg) |
| Fuel consumption (extra urban) | 15.7 l/100 km (15 US mpg) |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 7.2 kg/Hp |
| Weight-to-torque ratio | 4.7 kg/Nm |
| Power | 320 Hp @ 5000 rpm |
| Power per litre | 53.6 Hp/l |
| Torque | 495 Nm @ 4000 rpm (365.09 lb.-ft. @ 4000 rpm) |
| Engine layout | Front, Longitudinal |
| Engine displacement | 5967 cm3 (364.13 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 101.6 mm (4 in.) |
| Piston Stroke | 92 mm (3.62 in.) |
| Compression ratio | 9.4:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Engine oil capacity | 5.7 l (6.02 US qt) |
| Coolant capacity | 15.3 l (16.17 US qt) |
| Kerb Weight | 2310 kg (5092.68 lbs.) |
| Max. weight | 3175 kg (6999.68 lbs.) |
| Max load | 865 kg (1907 lbs.) |
| Trunk (boot) space – minimum | 453 l (16 cu. ft.) |
| Trunk (boot) space – maximum | 2962 l (104.6 cu. ft.) |
| Fuel tank capacity | 98 l (25.89 US gal) |
| Permitted trailer load with brakes (12%) | 3719 kg (8198.99 lbs.) |
| Length | 5052 mm (198.9 in.) |
| Width | 2002 mm (78.82 in.) |
| Height | 1948 mm (76.69 in.) |
| Wheelbase | 2946 mm (115.98 in.) |
| Front track | 1651 mm (65 in.) |
| Rear track | 1676 mm (65.98 in.) |
| Drivetrain Architecture | All wheel drive (4×4) |
| Number of gears | 4 |
| Gearbox type | Automatic transmission |
| Front suspension | Independent coil spring, Torsion |
| Rear suspension | Independent multi-link suspension, Coil spring |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Power steering | Hydraulic Steering |
| Tires size | 245/75 R16 |
| Wheel rims size | 7J x 16 |
Powertrain & Engine Architecture
The heart of this Yukon II variant is the 6.0-liter Vortec 5967 V8 engine. This engine, designated as the LQ4, is a member of GM’s small-block V8 family, known for its durability and relatively simple design. It features a cast iron block, aluminum cylinder heads, and a two-valve-per-cylinder configuration. Fuel delivery is managed by a multi-port fuel injection system, providing precise fuel metering for optimal performance and efficiency. The 4L60-E four-speed automatic transmission, a mainstay in GM trucks and SUVs, is paired with the engine. This transmission is electronically controlled, offering smooth shifts and adaptive shift patterns. While not the most modern transmission by today’s standards, the 4L60-E is known for its reliability when properly maintained.
Driving Characteristics
The 6.0-liter V8 and 4L60-E combination delivers adequate, though not exhilarating, performance. The Yukon II 1500 4WD weighs in at over 5,000 pounds, so acceleration is more about usable torque than outright speed. The engine produces a respectable 320 horsepower and 365 lb-ft of torque, providing sufficient power for everyday driving and towing. The automatic transmission’s gear ratios are geared towards maximizing fuel economy and towing capability, rather than sporty acceleration. Compared to the 5.3-liter V8 offered in lower trims, the 6.0-liter provides a noticeable increase in power and towing capacity. However, it lacks the responsiveness of a manual transmission or the higher output of some aftermarket modifications.
Equipment & Trim Levels
The Yukon II 1500 4WD with the 6.0-liter V8 typically came standard with features like air conditioning, power windows and locks, cruise control, and an AM/FM stereo. Higher trim levels, such as the SLT, added features like leather upholstery, heated seats, a premium sound system, and upgraded interior trim. Optional extras included a sunroof, rear entertainment system, and a navigation system. The interior design was generally functional and spacious, prioritizing comfort and practicality over luxury.
Chassis & Braking
The GMT800 platform utilizes a body-on-frame construction, providing a robust and durable chassis. The front suspension consists of an independent coil spring and torsion bar setup, while the rear suspension employs an independent multi-link design with coil springs. This suspension configuration provides a relatively comfortable ride, especially considering the vehicle’s size and weight. Braking duties are handled by ventilated discs at the front and solid discs at the rear. Anti-lock brakes (ABS) are standard, enhancing safety and control during emergency braking situations.
Market Reception & Comparison
The Yukon II 1500 6.0L 4WD was generally well-received by critics and consumers alike. It was praised for its spacious interior, strong towing capacity, and comfortable ride. However, fuel economy was a common criticism, as the 6.0-liter V8 is not particularly fuel-efficient. Compared to the 5.3-liter V8 Yukon models, the 6.0-liter offered a significant advantage in towing and hauling, making it a popular choice for those who frequently needed to tow trailers or boats. Reliability was generally good, although the 4L60-E transmission could be prone to issues if not properly maintained.
Legacy
Today, the GMT800 Yukon II 1500 6.0L 4WD remains a popular choice in the used car market, particularly among those seeking a capable and affordable full-size SUV. The 6.0-liter Vortec V8 is known for its longevity and relatively simple maintenance requirements. While fuel economy is still a concern, the Yukon II’s robust construction and ample space make it a practical and reliable vehicle for families and those who need to tow. Parts availability is generally good, and the vehicle’s relatively straightforward design makes it accessible to DIY mechanics. However, potential buyers should be aware of the potential for transmission issues and the importance of regular maintenance to ensure long-term reliability.
