The Chevrolet Suburban (GMTT1XX) 6.2 V8 AWD Automatic, introduced for the 2020 model year, represents the latest iteration of the longest-running SUV nameplate in continuous production. This variant occupies the premium end of the Suburban lineup, offering substantial power and all-wheel-drive capability within the full-size SUV segment. It’s built on the GMTT1XX platform, a truck-based chassis designed for maximum space, towing capacity, and durability. The 2020 Suburban marked the final year of the twelfth generation before a significant redesign for 2021.
Technical Specifications
| Brand | Chevrolet |
| Model | Suburban |
| Generation | Suburban (GMTT1XX) |
| Type (Engine) | 6.2 V8 (420 Hp) AWD Automatic |
| Start of production | 2020 year |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV |
| Seats | 7 |
| Doors | 5 |
| Fuel Type | Petrol (Gasoline) |
| Power | 420 Hp @ 5600 rpm |
| Torque | 624 Nm @ 4100 rpm / 460.24 lb.-ft. @ 4100 rpm |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | L87 |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 103.25 mm / 4.06 in. |
| Piston Stroke | 92 mm / 3.62 in. |
| Number of valves per cylinder | 2 |
| Fuel injection system | Direct injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | OHV, VVT Di |
| 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 |
| Trunk (boot) space – minimum | 1164 l / 41.11 cu. ft. |
| Trunk (boot) space – maximum | 4097 l / 144.68 cu. ft. |
| Length | 5732 mm / 225.67 in. |
| Width | 2059 mm / 81.06 in. |
| Height | 1923 mm / 75.71 in. |
| Wheelbase | 3407 mm / 134.13 in. |
| Front track | 1741 mm / 68.54 in. |
| Rear (Back) track | 1734 mm / 68.27 in. |
| 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 |
| Rear suspension | Independent multi-link suspension |
| Front brakes | Ventilated discs |
| Rear brakes | Ventilated discs |
| 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; 275/50 R22 |
| Wheel rims size | 18; 20; 22 |
Powertrain & Engine Architecture
At the heart of the 2020 Chevrolet Suburban 6.2L AWD is the L87 engine, a 6.2-liter naturally aspirated V8. This engine utilizes direct fuel injection, a technology that improves fuel efficiency and power output by injecting fuel directly into the combustion chamber. The engine also features Active Fuel Management (AFM), also known as cylinder deactivation, which shuts down four of the cylinders during light-load driving conditions to further enhance fuel economy. The valvetrain employs an overhead valve (OHV) configuration with variable valve timing (VVT) on the intake side. This combination provides a good balance of low-end torque and high-end horsepower. The engine is mated to a 10-speed Hydra-Matic automatic transmission, a sophisticated unit that offers smooth shifting and a wide gear ratio spread for optimal performance and efficiency. This transmission allows the engine to operate in its most efficient range more often, contributing to improved fuel economy.
Driving Characteristics
The 6.2-liter V8 and 10-speed automatic transmission deliver robust performance in the 2020 Suburban. Acceleration is strong, making it easy to merge onto highways or pass other vehicles. While not a sports car, the Suburban offers a confident and capable driving experience. The all-wheel-drive system provides enhanced traction in various weather conditions and on slippery surfaces. Compared to the smaller 5.3-liter V8 offered in other Suburban trims, the 6.2L provides significantly more power and torque, resulting in quicker acceleration and a more effortless feel, especially when towing. The 10-speed transmission’s close gear ratios help keep the engine in its powerband, maximizing responsiveness. However, the large size and weight of the Suburban mean that it doesn’t feel as nimble as smaller SUVs.
Equipment & Trim Levels
The 6.2L AWD Suburban typically came in higher trim levels, such as the Premier and High Country. Standard features included 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 and lane departure warning. Optional extras included a rear-seat entertainment system, a panoramic sunroof, and adaptive cruise control. The High Country trim added even more luxury features, such as unique exterior styling cues, upgraded interior materials, and additional driver-assistance technologies.
Chassis & Braking
The GMTT1XX platform utilizes a body-on-frame construction, providing a robust and durable foundation. The front suspension consists of independent coil springs, while the rear suspension features an independent multi-link setup. This configuration offers a comfortable ride quality, even on rough roads. All four wheels are equipped with ventilated disc brakes, providing ample stopping power. The electronic stability control system and anti-lock braking system (ABS) work together to enhance safety and control. Due to the vehicle’s weight, brake rotors and calipers are larger than those found on lighter vehicles.
Market Reception & Comparison
The 2020 Chevrolet Suburban 6.2L AWD Automatic was generally well-received by critics and consumers alike. It was praised for its spacious interior, powerful engine, and comfortable ride. However, its fuel economy was a common criticism, as expected for a vehicle of its size and weight. Compared to other trims in the Suburban lineup, the 6.2L AWD offered a significant performance upgrade but came at a higher price point. It competed with other full-size SUVs like the Ford Expedition, GMC Yukon, and Cadillac Escalade.
Legacy
The L87 6.2L V8 engine has proven to be a reliable and durable powertrain. While some owners have reported minor issues with the AFM system, the engine is generally considered to be robust and long-lasting. On the used car market, the 2020 Suburban 6.2L AWD Automatic holds its value well due to its desirable combination of power, space, and features. It remains a popular choice for families and those who need a capable and versatile SUV with substantial towing capacity. The GMTT1XX platform, while superseded by a newer generation, established a benchmark for full-size SUV capability and remains a respected design.
