The GMC Envoy II XUV, specifically the 4.2i 24V (275 Hp) variant with an automatic transmission, represented a significant offering in GMC’s mid-size SUV lineup during its brief production run from 2004 to 2005. Built on the GMT305 platform, the XUV (Cross Utility Vehicle) aimed to blend the comfort of an SUV with the cargo-carrying capability of a pickup truck, featuring a unique retractable rear roof. This particular engine and transmission combination positioned itself as the premium offering within the Envoy II XUV range, focusing on providing robust power for towing and hauling while maintaining a degree of everyday usability.
Technical Specifications
| Brand | GMC |
| Model | Envoy |
| Generation | Envoy II XUV (GMT305) |
| Type (Engine) | 4.2i 24V (275 Hp) Automatic |
| Start of production | 2004 |
| End of production | 2005 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 15.7 l/100 km (15 US mpg, 18 UK mpg, 6.4 km/l) |
| Fuel consumption (extra urban) | 11.7 l/100 km (20.1 US mpg, 24.1 UK mpg, 8.5 km/l) |
| Fuel consumption (combined) | 13.8 l/100 km (17 US mpg, 20.5 UK mpg, 7.2 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 8.2 kg/Hp, 122.6 Hp/tonne |
| Weight-to-torque ratio | 6 kg/Nm, 166.3 Nm/tonne |
| Power | 275 Hp @ 6000 rpm |
| Power per litre | 66.1 Hp/l |
| Torque | 373 Nm @ 3600 rpm (275.11 lb.-ft. @ 3600 rpm) |
| Maximum engine speed | 6300 rpm |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | LL8 |
| Engine displacement | 4160 cm3 (253.86 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 93 mm (3.66 in.) |
| Piston Stroke | 102 mm (4.02 in.) |
| Compression ratio | 10:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | DOHC |
| Engine oil capacity | 6.6 l (6.97 US qt | 5.81 UK qt) |
| Coolant capacity | 13.1 l (13.84 US qt | 11.53 UK qt) |
| Kerb Weight | 2243 kg (4944.97 lbs.) |
| Max. weight | 2812 kg (6199.4 lbs.) |
| Max load | 569 kg (1254.43 lbs.) |
| Trunk (boot) space – minimum | 1387 l (48.98 cu. ft.) |
| Trunk (boot) space – maximum | 2695 l (95.17 cu. ft.) |
| Fuel tank capacity | 94.6 l (24.99 US gal | 20.81 UK gal) |
| Permitted trailer load with brakes (12%) | 2631 kg (5800.36 lbs.) |
| Length | 5293 mm (208.39 in.) |
| Width | 1897 mm (74.69 in.) |
| Height | 1956 mm (77.01 in.) |
| Wheelbase | 3275 mm (128.94 in.) |
| Front track | 1603 mm (63.11 in.) |
| Rear (Back) track | 1578 mm (62.13 in.) |
| Ride height (ground clearance) | 203 mm (7.99 in.) |
| Minimum turning circle (turning diameter) | 12.5 m (41.01 ft.) |
| Drivetrain Architecture | Rear wheel drive |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 4 gears, automatic transmission Hydra-Matic |
| Front suspension | Double wishbone |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Hydraulic Steering |
| Tires size | 245/65 R17 |
| Wheel rims size | 7.0J x 17 |
Powertrain & Engine Architecture
The heart of the Envoy II XUV 4.2i was the LL8 engine, a 4.2-liter (253.86 cubic inches) inline-six cylinder powerplant. This engine was a member of GM’s Vortec family, known for its robust construction and relatively simple design. The LL8 featured a cast iron block with aluminum cylinder heads, incorporating dual overhead camshafts (DOHC) and four valves per cylinder. Fuel delivery was handled by a multi-port fuel injection system, providing precise fuel metering for optimal combustion. The engine produced 275 horsepower at 6000 rpm and 373 Nm (275.11 lb.-ft.) of torque at 3600 rpm. The Hydra-Matic 4L60-E four-speed automatic transmission was the sole transmission option for this variant. This transmission was known for its durability and smooth shifting characteristics, though it lacked the efficiency of more modern transmissions with higher gear counts.
Driving Characteristics
The 4.2L engine and four-speed automatic combination provided adequate, though not exhilarating, performance. Acceleration was reasonable for its size and weight, but the transmission’s gear ratios weren’t optimized for fuel economy. The 4L60-E transmission prioritized smooth operation over aggressive downshifting, resulting in a more relaxed driving experience. Compared to potential V6 or V8 options, the 4.2L offered a balance between power and fuel consumption. The rear-wheel-drive configuration contributed to a more traditional SUV feel, and while capable in moderate off-road conditions, it wasn’t designed for serious trail use.
Equipment & Trim Levels
The Envoy II XUV 4.2i typically came standard with features like air conditioning, power windows and locks, a CD player, and cloth upholstery. The XUV trim added the unique retractable rear roof, providing open-air cargo hauling capabilities. Optional extras included leather upholstery, a premium sound system, heated seats, and a navigation system. The interior design was functional and straightforward, prioritizing practicality over luxury.
Chassis & Braking
The GMT305 platform utilized a body-on-frame construction, providing a sturdy foundation for the vehicle. The front suspension consisted of a double wishbone setup, while the rear employed an independent multi-link suspension. This configuration aimed to balance ride comfort with handling stability. Braking duties were handled by ventilated discs at the front and solid discs at the rear. An Anti-lock Braking System (ABS) was standard, enhancing safety during emergency braking situations. The relatively heavy curb weight of 2243 kg (4944.97 lbs) necessitated a robust braking system.
Market Reception & Comparison
The Envoy II XUV, and particularly the 4.2i variant, received mixed reviews. Critics praised the unique retractable roof and spacious interior, but noted the relatively high fuel consumption and somewhat dated interior design. Compared to other mid-size SUVs of the time, the Envoy II XUV offered a distinctive feature set but lacked the refinement of some competitors. Fuel economy figures of 13.8 l/100 km (17 US mpg) were considered average for the class, and reliability was generally good, though the 4L60-E transmission could be prone to issues if not properly maintained.
Legacy
The GMC Envoy II XUV was a short-lived model, discontinued after only two years. However, it remains a unique and somewhat collectible vehicle today. The LL8 engine is known for its durability, and with proper maintenance, can provide many years of reliable service. The 4L60-E transmission, while not the most efficient, is also generally reliable. Used examples are relatively affordable, making them an attractive option for those seeking a distinctive and capable SUV. The XUV’s retractable roof continues to be its defining feature, setting it apart from more conventional SUVs.
