The Chevrolet Suburban (GMTT1XX, facelift 2024) 3.0d (305 Hp) 4WD Hydra-Matic represents the latest iteration of Chevrolet’s long-standing full-size SUV. Introduced in October 2024, this variant builds upon the GMTT1XX platform, a refreshed version of the popular Suburban model. It slots into the lineup as a diesel-powered option, offering a balance of towing capability, fuel efficiency, and refined performance within the broader Suburban range, which also includes gasoline-powered engines. The facelift brings updated styling cues and enhanced technology features to the already spacious and capable SUV.
Technical Specifications
| Brand | Chevrolet |
| Model | Suburban |
| Generation | Suburban (GMTT1XX, facelift 2024) |
| Type (Engine) | 3.0d (305 Hp) 4WD Hydra-Matic |
| Start of production | October, 2024 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | SUV |
| Seats | 7-9 |
| Doors | 5 |
| Fuel Type | Diesel |
| Weight-to-power ratio | 9 kg/Hp, 111.1 Hp/tonne |
| Weight-to-torque ratio | 4.1 kg/Nm, 244.4 Nm/tonne |
| Power | 305 Hp @ 3750 rpm |
| Power per litre | 101.9 Hp/l |
| Torque | 671 Nm @ 2750 rpm, 494.9 lb.-ft. @ 2750 rpm |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | Duramax / LM2 |
| Engine displacement | 2993 cm3, 182.64 cu. in. |
| Number of cylinders | 6 |
| Engine configuration | Inline |
| Cylinder Bore | 84 mm, 3.31 in. |
| Piston Stroke | 90 mm, 3.54 in. |
| Compression ratio | 15.2:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Valvetrain | DOHC |
| Engine systems | Start & Stop System, Particulate filter |
| Kerb Weight | 2746 kg, 6053.89 lbs |
| Max. weight | 3444 kg, 7592.72 lbs |
| Max load | 698 kg, 1538.83 lbs |
| Fuel tank capacity | 106 l, 28 US gal | 23.32 UK gal |
| Permitted trailer load with brakes (12%) | 3538 kg, 7799.95 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
The heart of the Suburban 3.0d is the Duramax LM2 inline-six cylinder diesel engine. This engine is a modern design featuring a cast iron block, aluminum cylinder head, and a sophisticated turbocharging system with an intercooler. The LM2 utilizes a diesel commonrail fuel injection system, delivering precise fuel metering for optimal combustion and efficiency. The engine produces 305 horsepower at 3750 rpm and a substantial 671 Nm (494.9 lb.-ft.) of torque at 2750 rpm. The engine also incorporates a particulate filter to meet stringent emissions standards. The Hydra-Matic 10-speed automatic transmission is paired with the engine, providing smooth and efficient gear changes. This transmission is known for its wide gear ratio spread, contributing to both fuel economy and strong acceleration.
Driving Characteristics
The 3.0d Suburban offers a distinctly different driving experience compared to its gasoline-powered siblings. The high torque output of the diesel engine provides effortless acceleration, particularly when towing or carrying a full load. The 10-speed automatic transmission is well-tuned, offering quick and seamless shifts. While not as overtly sporty as the gasoline versions, the diesel Suburban delivers a composed and confident ride. The gear ratios are optimized for both highway cruising and low-speed maneuvering. The permanent four-wheel drive system enhances traction in various conditions, making it a capable vehicle for inclement weather or off-road excursions.
Equipment & Trim Levels
The Suburban 3.0d typically comes well-equipped, reflecting its position as a premium trim level. Standard features generally include tri-zone automatic climate control, an 8-inch touchscreen infotainment system with Apple CarPlay and Android Auto compatibility, and a suite of advanced safety features such as automatic emergency braking, lane departure warning, and blind-spot monitoring. Interior upholstery is typically cloth or leatherette, with higher trims offering genuine leather options. Optional extras include a larger touchscreen display, a premium sound system, a panoramic sunroof, and adaptive cruise control. The 2024 facelift brought updated interior materials and a redesigned dashboard layout.
Chassis & Braking
The Suburban’s chassis is built on a robust body-on-frame construction, providing a solid foundation for its size and weight. The front suspension utilizes an independent coil spring setup with a transverse stabilizer bar, while the rear suspension employs an independent multi-link spring suspension, also with a stabilizer bar. Air suspension is available as an option, providing adjustable ride height and improved comfort. Braking duties are handled by ventilated discs on all four wheels, measuring 343×30.4 mm at the front and 345×25.4 mm at the rear. The anti-lock braking system (ABS) is standard, ensuring optimal braking performance in emergency situations.
Market Reception & Comparison
The Chevrolet Suburban 3.0d has been generally well-received by automotive critics and consumers alike. The diesel engine’s fuel efficiency and towing capacity are key selling points, particularly for those who frequently tow trailers or travel long distances. Compared to the gasoline-powered Suburban models, the 3.0d offers superior fuel economy, although it comes at a higher initial cost. The diesel engine also provides a more relaxed driving experience, thanks to its abundant torque. Reliability has been generally good, although diesel engines can be more complex to maintain than gasoline engines.
Legacy
The Duramax LM2 engine has proven to be a durable and reliable powerplant in other Chevrolet and GMC vehicles. The combination of the LM2 engine and the 10-speed Hydra-Matic transmission is expected to provide years of dependable service. In the used car market, the 2024 Suburban 3.0d is likely to hold its value well, due to its desirable features and strong reputation. Regular maintenance, including oil changes and fuel filter replacements, will be crucial to ensuring the longevity of the powertrain. As diesel technology continues to evolve, the Suburban 3.0d represents a modern and capable full-size SUV that caters to a specific segment of the market.
