The GMC Envoy II XL, produced from 2003 to 2006, represented the second generation of GMC’s mid-size SUV offering. Built on the GMT370 platform shared with the Chevrolet TrailBlazer and Buick Rainier, the Envoy II aimed to provide a blend of truck-based durability with family-friendly comfort and features. The 4.2i 24V (275 Hp) 4×4 Automatic variant occupied a position in the upper-mid range of the Envoy II lineup, offering a significant step up in power and capability compared to the base 4.2L engine, while remaining more accessible than the potential for aftermarket modifications. This configuration was targeted towards buyers needing substantial towing capacity and all-weather performance without the price premium of a larger, full-size SUV.
Technical Specifications
| Brand | GMC |
| Model | Envoy |
| Generation | Envoy II XL (GMT370) |
| 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 | 7 |
| Doors | 5 |
| Fuel consumption (urban) | 15.7 l/100 km (15 US mpg, 18 UK mpg, 6.4 km/l) |
| Fuel consumption (extra urban) | 11.8 l/100 km (19.9 US mpg, 23.9 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 | 8.4 kg/Hp, 118.4 Hp/tonne |
| Weight-to-torque ratio | 6.2 kg/Nm, 160.6 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 | 2322 kg (5119.13 lbs.) |
| Max. weight | 2903 kg (6400.02 lbs.) |
| Max load | 581 kg (1280.89 lbs.) |
| Trunk (boot) space – minimum | 631 l (22.28 cu. ft.) |
| Trunk (boot) space – maximum | 2839 l (100.26 cu. ft.) |
| Fuel tank capacity | 96.1 l (25.39 US gal | 21.14 UK gal) |
| Permitted trailer load with brakes (12%) | 2630 kg (5798.16 lbs.) |
| Length | 5271 mm (207.52 in.) |
| Width | 1897 mm (74.69 in.) |
| Height | 1917 mm (75.47 in.) |
| Wheelbase | 3275 mm (128.94 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) | 12.6 m (41.34 ft.) |
| Approach angle | 34.1° |
| Departure angle | 23.6° |
| 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 XL 4.2i 4×4 was the LL8 engine, a 4.2-liter (4160 cc) inline-six cylinder powerplant. This engine was a significant upgrade over the earlier 4.3L V6, featuring a more modern design with dual overhead camshafts (DOHC) and multi-port fuel injection. The LL8 produced 275 horsepower at 6000 rpm and 373 lb-ft of torque at 3600 rpm. The Hydra-Matic 4L60-E four-speed automatic transmission was the sole transmission option for this engine configuration. This transmission was known for its durability and smooth shifting, but its limited number of gears meant it wasn’t as efficient as more modern transmissions. The engine’s longitudinal mounting and rear-wheel-drive based architecture allowed for a robust four-wheel-drive system, enhancing traction in various conditions.
Driving Characteristics
The 4.2L engine and four-speed automatic combination provided adequate, though not exhilarating, performance. Acceleration from 0 to 60 mph was typically in the 7.5-8.5 second range, depending on load and terrain. The automatic transmission’s gear ratios were geared more towards towing and everyday drivability than outright speed. While the engine had sufficient torque for passing maneuvers, the lack of a fifth or sixth gear meant that highway cruising at higher speeds resulted in a noticeable engine drone and lower fuel economy. Compared to the base 4.2L engine, the 275 hp version offered a substantial improvement in responsiveness and towing capacity. It wasn’t as sporty as some competitors with V8 engines, but it provided a good balance of power and efficiency for its intended purpose.
Equipment & Trim Levels
The Envoy II XL 4.2i 4×4 Automatic typically came standard with features like air conditioning, power windows and locks, cruise control, and an AM/FM stereo with a CD player. The XL trim level added features such as alloy wheels, upgraded interior trim, and a leather-wrapped steering wheel. Optional extras included a premium sound system, a sunroof, heated seats, and a navigation system. The interior generally featured cloth upholstery, though leather was available as an option. The dashboard layout was functional and straightforward, with easy-to-read gauges and controls.
Chassis & Braking
The GMT370 platform utilized a body-on-frame construction, providing a robust and durable chassis. The front suspension consisted of an independent double wishbone setup, while the rear suspension employed an independent multi-link design. This suspension configuration aimed to provide a comfortable ride while maintaining good handling characteristics. The Envoy II XL 4.2i 4×4 featured ventilated disc brakes at the front and solid discs at the rear. An anti-lock braking system (ABS) was standard, enhancing braking performance and stability. The hydraulic power steering provided responsive and precise steering control.
Market Reception & Comparison
The GMC Envoy II XL 4.2i 4×4 Automatic was generally well-received by critics as a capable and practical SUV. It was praised for its spacious interior, comfortable ride, and strong towing capacity. However, some reviewers noted its relatively low fuel economy and the lack of a more modern transmission. Compared to other trims in the Envoy II lineup, the 4.2i 4×4 offered a significant performance upgrade over the base engine, but it came at a higher price point. It competed with vehicles like the Chevrolet TrailBlazer, Ford Explorer, and Jeep Grand Cherokee.
Legacy
The LL8 4.2L engine, while generally reliable, is known to have some potential issues, including oil leaks and occasional intake manifold gasket failures. The Hydra-Matic 4L60-E transmission is also known for its durability, but regular maintenance, including fluid changes, is crucial to prevent issues. Today, the Envoy II XL 4.2i 4×4 can be found on the used car market at relatively affordable prices. It remains a viable option for buyers seeking a capable and spacious SUV with good towing capacity, but potential buyers should be aware of the potential maintenance issues associated with the engine and transmission.
