The GMC Envoy II, produced between 2003 and 2006, represented the second generation of GMC’s mid-size SUV offering. Built on the GMT360 platform shared with the Chevrolet TrailBlazer and Buick Rainier, the Envoy II aimed to provide a blend of truck-based durability with improved refinement and features. The 4.2i 24V (275 Hp) 4×4 Automatic variant occupied a position as the premium engine option within the Envoy II lineup, offering a significant performance upgrade over the standard 4.2L engine and the available inline-6 cylinder. This model was targeted towards buyers needing substantial towing capacity and all-weather capability, while still desiring a comfortable and well-equipped SUV.
Technical Specifications
| Brand | GMC |
| Model | Envoy |
| Generation | Envoy II (GMT360) |
| Type (Engine) | 4.2i 24V (275 Hp) 4×4 Automatic |
| Start of production | 2003 |
| End of production | 2006 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV |
| Seats | 5 |
| Doors | 5 |
| Fuel consumption (urban) | 15.6 l/100 km (15.1 US mpg, 18.1 UK mpg, 6.4 km/l) |
| Fuel consumption (extra urban) | 11.2 l/100 km (21 US mpg, 25.2 UK mpg, 8.9 km/l) |
| Fuel consumption (combined) | 13 l/100 km (18.1 US mpg, 21.7 UK mpg, 7.7 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 7.9 kg/Hp, 127.2 Hp/tonne |
| Weight-to-torque ratio | 5.8 kg/Nm, 172.5 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 | 2162 kg (4766.39 lbs.) |
| Max. weight | 2608 kg (5749.66 lbs.) |
| Max load | 446 kg (983.26 lbs.) |
| Trunk (boot) space – minimum | 1162 l (41.04 cu. ft.) |
| Trunk (boot) space – maximum | 2268 l (80.09 cu. ft.) |
| Fuel tank capacity | 83.3 l (22.01 US gal | 18.32 UK gal) |
| Permitted trailer load with brakes (12%) | 2812 kg (6199.4 lbs.) |
| Length | 4866 mm (191.57 in.) |
| Width | 1894 mm (74.57 in.) |
| Height | 1826 mm (71.89 in.) |
| Wheelbase | 2869 mm (112.95 in.) |
| Front track | 1603 mm (63.11 in.) |
| Rear (Back) track | 1576 mm (62.05 in.) |
| Ride height (ground clearance) | 203 mm (7.99 in.) |
| Minimum turning circle (turning diameter) | 11.1 m (36.42 ft.) |
| Approach angle | 33.9° |
| Departure angle | 23° |
| Drive wheel | All wheel drive (4×4) |
| 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 4.2i 4×4 was the LL8 engine, a 4.2-liter (4160 cc) inline-6 cylinder gasoline engine. This engine was a significant upgrade from the standard 4.2L pushrod V6, featuring dual overhead camshafts (DOHC) and four valves per cylinder, contributing to its higher horsepower and torque output. The LL8 utilized multi-port fuel injection, delivering fuel directly to each intake port for optimized combustion. The engine’s 10:1 compression ratio was a balance between performance and reliability. 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 additional gears. The transmission was electronically controlled, adapting shift points based on throttle position and vehicle speed.
Driving Characteristics
The 275 horsepower and 373 lb-ft of torque provided by the LL8 engine gave the Envoy II 4×4 a noticeable performance advantage over lower-trim models. Acceleration was brisk for a vehicle of its size, and the automatic transmission provided smooth, if not particularly sporty, gear changes. The 4L60-E transmission’s gear ratios were geared more towards towing and everyday drivability than outright acceleration. Compared to the manual transmission options available on other Envoy trims, the automatic offered greater convenience but sacrificed some driver engagement and fuel efficiency. The all-wheel-drive system provided enhanced traction in inclement weather and on slippery surfaces, making it a capable vehicle for year-round use. However, the Envoy II’s truck-based platform resulted in a higher center of gravity, leading to some body roll during cornering.
Equipment & Trim Levels
The 4.2i 4×4 Automatic trim typically included a generous array of standard features. These commonly included leather upholstery, power-adjustable front seats, a premium sound system, automatic climate control, and alloy wheels. Optional extras often included a sunroof, rear-seat entertainment system, and upgraded audio options. The interior design was functional and comfortable, though it lacked the more modern aesthetics found in some competing SUVs. The Envoy II’s interior materials were generally durable, but some plastics felt somewhat low-quality.
Chassis & Braking
The GMT360 platform utilized a body-on-frame construction, providing a robust and durable chassis. The front suspension featured an independent double wishbone design, while the rear suspension employed an independent multi-link setup. This suspension configuration aimed to balance ride comfort with handling stability. The Envoy II 4×4 was equipped with ventilated disc brakes at the front and solid discs at the rear. An anti-lock braking system (ABS) was standard, enhancing braking performance and control. The steering system was a hydraulic rack-and-pinion setup, providing responsive and precise steering feel.
Market Reception & Comparison
The GMC Envoy II 4.2i 4×4 Automatic was generally well-received by critics, who praised its powerful engine, comfortable ride, and spacious interior. However, some reviewers noted its relatively poor fuel economy and somewhat dated interior design. Compared to other trims in the Envoy II lineup, the 4.2i 4×4 offered a significant performance upgrade but came at a higher price point. Fuel economy was notably worse than the inline-6 cylinder models, and reliability was generally comparable, though the more complex DOHC engine could potentially require more maintenance over the long term. Competitors such as the Ford Explorer and Jeep Grand Cherokee offered similar levels of performance and features, often with more modern styling and improved fuel efficiency.
Legacy
The LL8 4.2L engine, while powerful, wasn’t without its potential issues. Common concerns included oil consumption and occasional timing chain wear. The 4L60-E transmission, while durable, could experience issues with solenoid failure or torque converter problems. Despite these potential issues, the Envoy II 4.2i 4×4 Automatic remains a relatively affordable and capable SUV in the used car market. Its robust construction and powerful engine make it a popular choice for buyers seeking a reliable and versatile vehicle for towing, hauling, and all-weather driving. However, prospective buyers should be aware of the potential maintenance costs associated with the LL8 engine and 4L60-E transmission.
