The GMC Sierra 3500HD, specifically the 2024 model year facelift featuring the Crew Cab Standard Bed configuration with the 6.6-liter Duramax Turbo Diesel V8 engine producing 470 horsepower, represents GMC’s heavy-duty pickup truck offering. Introduced as part of the GMTT1XX generation, this variant caters to buyers needing substantial towing and hauling capabilities. The 2024 refresh brought updated styling and technology, building upon the already robust foundation of the Sierra HD line. This particular configuration, pairing the powerful diesel engine with a ten-speed automatic transmission, positions itself as a workhorse capable of handling demanding tasks while offering a degree of refinement for daily driving.
Technical Specifications
| Brand | GMC |
| Model | Sierra 3500HD |
| Generation | Sierra 3500HD V (GMTT1XX, facelift 2024) Crew Cab Standard Bed |
| Type (Engine) | 6.6 Duramax TD V8 (470 Hp) SRW Automatic |
| Start of production | 2024 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 5 |
| Doors | 4 |
| Fuel Type | Diesel |
| Weight-to-power ratio | 7.3 kg/Hp, 137.3 Hp/tonne |
| Weight-to-torque ratio | 2.6 kg/Nm, 386.1 Nm/tonne |
| Power | 470 Hp @ 2800 rpm |
| Power per litre | 71.2 Hp/l |
| Torque | 1322 Nm @ 1600 rpm (975.06 lb.-ft. @ 1600 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | L5P |
| Engine displacement | 6604 cm3 (403 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 103 mm (4.06 in.) |
| Piston Stroke | 99 mm (3.9 in.) |
| Compression ratio | 16:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Valvetrain | OHV |
| Engine oil capacity | 9.5 l (10.04 US qt | 8.36 UK qt) |
| Coolant | 28.5 l (30.12 US qt | 25.08 UK qt) |
| Kerb Weight | 3424 kg (7548.63 lbs.) |
| Max. weight | 5330 kg (11750.64 lbs.) |
| Max load | 1906 kg (4202.01 lbs.) |
| Fuel tank capacity | 136 l (35.93 US gal | 29.92 UK gal) |
| Permitted trailer load with brakes (12%) | 7257 kg (15998.95 lbs.) |
| Length | 6369 mm (250.75 in.) |
| Width including mirrors | 2079 mm (81.85 in.) |
| Height | 2054 mm (80.87 in.) |
| Wheelbase | 4037 mm (158.94 in.) |
| Front track | 1731 mm (68.15 in.) |
| Rear (Back) track | 1736 mm (68.35 in.) |
| Ride height (ground clearance) | 284 mm (11.18 in.) |
| 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 | 10 gears, automatic transmission Allison |
| Front suspension | Independent torsion bar, double wishbone |
| Rear suspension | Rigid axle suspension, Leaf spring |
| Front brakes | Ventilated discs, 355×40 mm |
| Rear brakes | Ventilated discs, 360×34 mm |
Powertrain & Engine Architecture
The heart of this Sierra 3500HD is the 6.6-liter Duramax L5P turbo-diesel V8 engine. This engine is a cornerstone of GMC’s heavy-duty lineup, known for its robust construction and substantial torque output. The L5P utilizes a cast iron block, aluminum cylinder heads, and a forged steel crankshaft, contributing to its durability. The engine employs a common-rail direct fuel injection system, delivering fuel at extremely high pressures for optimized combustion. A variable geometry turbocharger with an intercooler further enhances performance and efficiency. The overhead valve (OHV) valvetrain, while a more traditional design, is favored for its reliability and low-end torque characteristics. Paired with the engine is the Allison 10-speed automatic transmission, a heavy-duty unit designed to handle the immense torque produced by the Duramax engine. This transmission features electronically controlled shifts and a wide gear ratio spread for optimal towing and hauling performance.
Driving Characteristics
The 470 horsepower and 1322 lb-ft of torque delivered by this combination translate into impressive real-world performance. While not designed for outright speed, the Sierra 3500HD excels at moving substantial loads. Acceleration is brisk, even with a trailer attached, and the ten-speed automatic transmission keeps the engine in its optimal power band. Compared to lower-output gasoline engine options, the Duramax provides significantly more low-end torque, making it ideal for towing and hauling heavy materials. Compared to the 6.6L gasoline engine, the diesel offers a more relaxed driving experience when towing, requiring less frequent downshifting. The Allison transmission’s gear ratios are well-suited for both highway cruising and demanding off-road conditions. The ride quality, while firm due to the heavy-duty suspension, is surprisingly comfortable, especially in the Crew Cab configuration.
Equipment & Trim Levels
The 2024 Sierra 3500HD Crew Cab with the Duramax engine typically comes standard with a comprehensive suite of features. These include a user-friendly infotainment system with a large touchscreen display, Apple CarPlay and Android Auto compatibility, and a premium sound system. Interior upholstery is typically cloth or leather, depending on the specific trim level (SLE, AT4, Denali). Standard safety features include multiple airbags, anti-lock brakes, and stability control. Optional extras often include a power sunroof, heated and ventilated seats, a rear-seat entertainment system, and advanced driver-assistance systems such as adaptive cruise control and lane departure warning. The AT4 trim adds off-road focused features like skid plates and upgraded suspension, while the Denali trim offers a more luxurious interior and exterior appointments.
Chassis & Braking
The Sierra 3500HD utilizes a robust chassis designed to withstand heavy loads. The front suspension features an independent torsion bar setup with double wishbones, providing a comfortable ride and good handling. The rear suspension employs a traditional leaf spring design, optimized for load-carrying capacity. Braking duties are handled by ventilated disc brakes on all four wheels, providing ample stopping power. The front brakes measure 355x40mm, while the rear brakes are 360x34mm. An Anti-lock Braking System (ABS) is standard, enhancing safety during emergency braking situations. The steering system is a hydraulic power steering setup, providing a responsive and precise feel.
Market Reception & Comparison
The GMC Sierra 3500HD with the Duramax diesel engine has consistently received positive reviews from automotive critics. It is praised for its powerful engine, smooth-shifting transmission, and impressive towing and hauling capabilities. Fuel economy, while not a primary concern for heavy-duty truck buyers, is respectable for a vehicle of this size and capability. Compared to gasoline-powered Sierra 3500HD models, the Duramax diesel offers significantly better fuel economy when towing heavy loads. Reliability has generally been good, although diesel engines can be more expensive to maintain than gasoline engines due to the complexity of the fuel injection system and emissions control equipment. Compared to competitors like the Ford Super Duty and Ram 3500, the Sierra 3500HD offers a compelling combination of power, refinement, and technology.
Legacy
The Duramax diesel engine has become a benchmark in the heavy-duty truck segment, known for its longevity and reliability. The L5P version, found in the 2024 Sierra 3500HD, continues this tradition. These trucks, even with high mileage, often command strong resale values in the used car market, particularly those well-maintained and used primarily for towing. The Allison transmission is also highly regarded for its durability and smooth operation. While modern emissions control systems can add complexity and potential maintenance costs, the fundamental robustness of the Duramax engine and Allison transmission ensures that these trucks remain capable and dependable workhorses for years to come.
