The Chevrolet Suburban (GMTT1XX, facelift 2024) equipped with the 6.2-liter V8 engine and four-wheel drive represents the latest iteration of Chevrolet’s longest-running vehicle nameplate. Introduced in October 2024, this version builds upon the substantial redesign of the GMTT1XX platform, offering a blend of spaciousness, capability, and modern technology. Positioned as a premium offering within the Suburban lineup, the 6.2L 4WD variant caters to buyers prioritizing towing capacity, powerful acceleration, and all-weather performance. It sits above the 5.3L V8 and diesel engine options, offering the highest horsepower and torque figures in the range.
Technical Specifications
| Brand | Chevrolet |
| Model | Suburban |
| Generation | Suburban (GMTT1XX, facelift 2024) |
| Type (Engine) | 6.2 V8 (420 Hp) 4WD Hydra-Matic |
| Start of production | October, 2024 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV |
| Seats | 7-9 |
| Doors | 5 |
| Fuel consumption (economy) – urban (EPA) | 16.8 l/100 km (14 US mpg, 16.8 UK mpg, 6 km/l) |
| Fuel consumption (economy) – extra urban (EPA) | 13.1 l/100 km (18 US mpg, 21.6 UK mpg, 7.6 km/l) |
| Fuel consumption (economy) – combined (EPA) | 14.7 l/100 km (16 US mpg, 19.2 UK mpg, 6.8 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 6.5 kg/Hp, 153 Hp/tonne |
| Weight-to-torque ratio | 4.4 kg/Nm, 227 Nm/tonne |
| Power | 420 Hp @ 5600 rpm |
| Power per litre | 68.2 Hp/l |
| Torque | 623 Nm @ 4100 rpm (459.5 lb.-ft. @ 4100 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | EcoTec3 / L87 |
| Engine displacement | 6162 cm3 (376.03 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 103.25 mm (4.06 in.) |
| Piston Stroke | 92 mm (3.62 in.) |
| Compression ratio | 11.5:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Direct injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | OHV, VVT |
| Engine oil capacity | 7.6 l (8.03 US qt | 6.69 UK qt) |
| Coolant | 14.3 l (15.11 US qt | 12.58 UK qt) |
| Kerb Weight | 2745 kg (6051.69 lbs.) |
| Max. weight | 3476 kg (7663.27 lbs.) |
| Max load | 731 kg (1611.58 lbs.) |
| Fuel tank capacity | 106 l (28 US gal | 23.32 UK gal) |
| Permitted trailer load with brakes (12%) | 3583 kg (7899.16 lbs.) |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives permanently the four wheels of the vehicle. |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 10 gears, automatic transmission Hydra-Matic |
| Front suspension | Independent coil spring, Transverse stabilizer, Air Suspension – Optional |
| Rear suspension | Independent multi-link spring suspension with stabilizer, Air Suspension – Optional |
| Front brakes | Ventilated discs, 343×30.4 mm |
| Rear brakes | Ventilated discs, 345×25.4 mm |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 265/65 R18; 275/55 R20; 275/60 R20; 275/50 R22; 285/40 R24 |
| Wheel rims size | 18; 20; 22; 24 |
Powertrain & Engine Architecture
At the heart of the 2024 Suburban 6.2L 4WD lies the EcoTec3 L87 V8 engine. This 6.2-liter (376 cubic inch) naturally aspirated engine utilizes direct injection, cylinder deactivation, and variable valve timing (VVT) to optimize both power and fuel efficiency. The engine produces 420 horsepower at 5600 rpm and 460 lb-ft of torque at 4100 rpm. The cylinder deactivation system allows the engine to operate on four cylinders during light-load conditions, improving fuel economy. The Hydra-Matic 10-speed automatic transmission is standard, providing a wide gear ratio spread for improved acceleration and towing performance. This transmission is known for its smooth shifts and responsiveness. The engine is longitudinally mounted, sending power to all four wheels via a sophisticated four-wheel-drive system.
Driving Characteristics
The 6.2L Suburban delivers robust acceleration, especially considering its substantial weight. The 10-speed automatic transmission allows the engine to stay within its optimal power band, providing strong pull throughout the rev range. While not as fuel-efficient as the smaller engine options or the diesel, the 6.2L offers a more confident and effortless driving experience, particularly when fully loaded or towing. Compared to the 5.3L V8, the 6.2L provides a noticeable increase in power and torque, resulting in quicker acceleration and improved towing capacity. The four-wheel-drive system provides enhanced traction in various weather conditions and off-road scenarios.
Equipment & Trim Levels
The 6.2L 4WD Suburban is typically offered in higher trim levels such as High Country and Z71. Standard features generally include leather upholstery, heated and ventilated front seats, a premium sound system, a large touchscreen infotainment system with Apple CarPlay and Android Auto compatibility, and a suite of advanced safety features like automatic emergency braking, lane departure warning, and adaptive cruise control. Optional extras often include a panoramic sunroof, rear-seat entertainment system, and advanced trailering technology. The High Country trim adds unique exterior styling cues and additional luxury features.
Chassis & Braking
The GMTT1XX platform utilizes a fully independent suspension system, providing a comfortable ride and good handling characteristics. The front suspension features coil springs and a transverse stabilizer bar, while the rear suspension employs a multi-link setup with a stabilizer bar. Available air suspension provides adjustable ride height and further enhances ride comfort. Braking duties are handled by ventilated disc brakes on all four wheels. The braking system is assisted by ABS (Anti-lock Braking System) and electronic stability control. The Suburban’s substantial weight necessitates a robust braking system to ensure adequate stopping power.
Market Reception & Comparison
The 6.2L Suburban has generally received positive reviews from automotive critics, who praise its powerful engine, spacious interior, and comfortable ride. However, its fuel economy is often cited as a drawback. Compared to the 5.3L V8, the 6.2L offers significantly more power and towing capacity, but at the expense of fuel efficiency. The diesel engine provides better fuel economy but lacks the outright power of the 6.2L. The Suburban competes with other large SUVs such as the Ford Expedition, GMC Yukon, and Cadillac Escalade. The Suburban often stands out due to its exceptional cargo space and overall value proposition.
Legacy
The EcoTec3 L87 engine has proven to be a reliable and durable powertrain. While long-term reliability data for the 2024 facelift is still emerging, previous iterations of the L87 have demonstrated good longevity with proper maintenance. On the used car market, Suburbans equipped with the 6.2L engine tend to command higher prices due to their desirable performance and towing capabilities. The GMTT1XX platform represents a significant step forward in terms of refinement and technology, solidifying the Suburban’s position as a leading full-size SUV.
