The GMC Envoy II, specifically the 4.2i 24V (291 hp) variant with an automatic transmission, represented a significant update to GMC’s mid-size SUV offering. Produced from 2006 to 2008 as part of the GMT360 platform generation, this model aimed to provide a blend of capability, comfort, and a more refined driving experience compared to its predecessor. It occupied a middle ground in the Envoy lineup, positioned above the base 4.2L engine option but below potential future high-performance trims that never materialized. The Envoy II competed directly with vehicles like the Chevrolet TrailBlazer, Ford Explorer, and Jeep Grand Cherokee, offering a rear-wheel-drive based platform with available four-wheel drive.
Technical Specifications
| Brand | GMC |
| Model | Envoy |
| Generation | Envoy II (GMT360) |
| Type (Engine) | 4.2i 24V (291 Hp) Automatic |
| Start of production | 2006 |
| End of production | 2008 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV |
| Seats | 5 |
| Doors | 5 |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 6.9 kg/Hp, 145.6 Hp/tonne |
| Weight-to-torque ratio | 5.3 kg/Nm, 188.7 Nm/tonne |
| Power | 291 Hp @ 6000 rpm |
| Power per litre | 70 Hp/l |
| Torque | 377 Nm @ 4800 rpm, 278.06 lb.-ft. @ 4800 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 | 10.3:1 |
| 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 | 10.2 l, 10.78 US qt | 8.97 UK qt |
| Kerb Weight | 1998 kg, 4404.84 lbs |
| Max. weight | 2517 kg, 5549.04 lbs |
| Max load | 519 kg, 1144.2 lbs |
| Trunk (boot) space – minimum | 1127 l, 39.8 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%) | 2858 kg, 6300.81 lbs |
| Length | 4866 mm, 191.57 in. |
| Width | 1897 mm, 74.69 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 | 29° |
| Departure angle | 23° |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the rear wheels of the vehicle. |
| 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 4.2i was the LL8 engine, a 4.2-liter (253.86 cubic inches) inline-six cylinder powerplant. This engine was a descendant of the earlier 4.2L and 4.3L V6 engines used in various GM trucks and SUVs, but featured a more modern design with dual overhead camshafts (DOHC) and multi-port fuel injection. The LL8 produced 291 horsepower at 6000 rpm and 377 Nm (278.06 lb-ft) of torque at 4800 rpm. The engine’s architecture prioritized smooth power delivery over outright performance, making it well-suited for towing and everyday driving. 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 relatively smooth shifting, although it lacked the efficiency of more modern transmissions with additional gears. The transmission was calibrated to provide comfortable cruising and adequate acceleration, but wasn’t particularly sporty.
Driving Characteristics
The 4.2L engine and four-speed automatic combination in the Envoy II delivered a comfortable, if not exhilarating, driving experience. Acceleration was adequate for merging onto highways and passing other vehicles, but it wasn’t a particularly quick SUV. The automatic transmission’s gear ratios were optimized for fuel economy and towing capacity, rather than rapid acceleration. Compared to the potential for a more powerful V8, the 4.2L felt less strained during towing, but also less capable of quick bursts of speed. The rear-wheel-drive platform provided a more traditional SUV feel, offering good stability and predictable handling. However, it lacked the all-weather capability of four-wheel-drive models.
Equipment & Trim Levels
The Envoy II 4.2i Automatic typically came standard with features such as air conditioning, power windows and locks, a CD player, and cloth upholstery. Higher trim levels, often denoted by specific packages, added features like leather seats, a premium sound system, alloy wheels, and a sunroof. Optional extras included a navigation system, rear-seat entertainment system, and upgraded towing packages. The interior design was functional and relatively spacious, offering comfortable seating for five passengers. The dashboard layout was straightforward and easy to use, with clearly labeled controls.
Chassis & Braking
The Envoy II 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. 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 steering system was a hydraulic rack-and-pinion setup, providing responsive and precise steering feel.
Market Reception & Comparison
The GMC Envoy II 4.2i Automatic received generally positive reviews from automotive critics. It was praised for its comfortable ride, spacious interior, and capable towing capacity. However, some critics noted that the 4.2L engine lacked the power and refinement of some of its competitors’ V6 or V8 engines. Fuel economy was also a concern, as the Envoy II wasn’t particularly fuel-efficient compared to newer SUVs. Compared to the higher-output V8 options available in some competing models, the 4.2L offered a more affordable entry point into the mid-size SUV segment. It also tended to be more reliable than some of the more complex V8 powertrains.
Legacy
The LL8 4.2L engine, when paired with the 4L60-E transmission, has proven to be a relatively reliable powertrain. While not without its potential issues (such as oil leaks and occasional transmission problems), it generally holds up well with proper maintenance. In the used car market, the Envoy II 4.2i Automatic represents a relatively affordable and capable SUV option. Its simplicity and durability make it an attractive choice for buyers seeking a dependable vehicle for everyday use and occasional towing. However, potential buyers should be aware of the vehicle’s age and potential maintenance needs, and a thorough inspection is always recommended.
