The Chevrolet Silverado 2500 HD IV, specifically the Double Cab Long Bed configuration with the 6.6-liter Duramax Turbo Diesel V8 engine paired with an Allison 10-speed automatic transmission, represents a significant offering in the heavy-duty pickup truck segment. Introduced with the 2024 facelift (based on the T1XX platform), this variant builds upon Chevrolet’s long-standing reputation for robust trucks designed for demanding work and towing applications. Production began in 2023, positioning this model as a key competitor to Ford’s Super Duty and Ram’s heavy-duty offerings in the North American market. This particular combination targets buyers needing substantial capability without sacrificing everyday usability.
Technical Specifications
| Brand | Chevrolet |
| Model | Silverado 2500 HD |
| Generation | Silverado 2500 HD IV (T1XX, facelift 2024) Double Cab Long Bed |
| Type (Engine) | 6.6 Duramax TD V8 (470 Hp) Automatic |
| Start of production | 2023 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 5 |
| Doors | 4 |
| Fuel Type | Diesel |
| Weight-to-power ratio | 7.1 kg/Hp, 141.1 Hp/tonne |
| Weight-to-torque ratio | 2.5 kg/Nm, 397 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 | 3330 kg (7341.39 lbs.) |
| Max. weight | 4944 kg (10899.65 lbs.) |
| Max load | 1614 kg (3558.26 lbs.) |
| Fuel tank capacity | 136 l (35.93 US gal | 29.92 UK gal) |
| Permitted trailer load with brakes (12%) | 8119 kg (17899.33 lbs.) |
| Length | 6514 mm (256.46 in.) |
| Width including mirrors | 2079 mm (81.85 in.) |
| Height | 2027 mm (79.8 in.) |
| Wheelbase | 4127 mm (162.48 in.) |
| Front track | 1731 mm (68.15 in.) |
| Rear (Back) track | 1736 mm (68.35 in.) |
| Ride height (ground clearance) | 258 mm (10.16 in.) |
| Drivetrain Architecture | Rear wheel drive. Internal Combustion engine (ICE) drives the rear wheels. |
| 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 |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Cone worm with recirculation balls |
| Power steering | Hydraulic Steering |
| Tires size | 245/75 R17; 265/70 R17; 275/70 R18; 265/65 R20 |
| Wheel rims size | 7.5J x 17; 8J x 18; 8.5J x 20 |
Powertrain & Engine Architecture
The heart of this Silverado 2500 HD variant is the 6.6-liter L5P Duramax turbocharged diesel V8 engine. This engine is a cornerstone of Chevrolet’s heavy-duty lineup, known for its durability and substantial torque output. The L5P utilizes a cast iron block and aluminum cylinder heads, contributing to its robust construction. It employs a diesel commonrail fuel injection system, delivering highly pressurized fuel directly into the cylinders for efficient combustion. The engine features an overhead valve (OHV) valvetrain, a design choice prioritizing low-end torque and reliability. A single variable geometry turbocharger with an intercooler maximizes power and efficiency across the engine’s operating range. The Allison 10-speed automatic transmission is specifically calibrated to handle the engine’s immense 1322 Nm (975 lb-ft) of torque, providing smooth and responsive shifting. This transmission features electronically controlled shifts and a tow/haul mode optimized for heavy loads.
Driving Characteristics
The 6.6-liter Duramax with the Allison 10-speed automatic delivers a driving experience focused on capability and control. While not designed for outright speed, the 470 horsepower and massive torque reserves provide confident acceleration, even when heavily loaded. The 10-speed transmission’s closely spaced gear ratios keep the engine within its optimal power band, minimizing turbo lag and maximizing pulling power. Compared to gasoline-powered Silverado 2500 HD models, this diesel variant offers significantly more torque at lower RPMs, making it ideal for towing and hauling. Compared to earlier Duramax engines, the 10-speed Allison provides smoother shifts and improved fuel economy. The ride quality, while firm due to the heavy-duty suspension, is surprisingly compliant for a truck of this size.
Equipment & Trim Levels
The Silverado 2500 HD Double Cab Long Bed with the Duramax engine is typically offered in higher trim levels, such as LT, LTZ, and High Country. Standard features generally include a comprehensive suite of safety technologies, such as automatic emergency braking and lane departure warning. Interior amenities typically include a user-friendly infotainment system with Apple CarPlay and Android Auto compatibility, comfortable seating, and a spacious cabin. Higher trims add features like leather upholstery, heated and ventilated seats, a premium sound system, and advanced trailering technologies. Optional extras include a power sunroof, a rear-seat entertainment system, and various appearance packages.
Chassis & Braking
The Silverado 2500 HD utilizes a fully boxed frame constructed from high-strength steel, providing a solid foundation for its heavy-duty capabilities. The front suspension features an independent torsion bar setup with double wishbone components, while the rear suspension employs a traditional leaf spring design. This configuration balances ride comfort with load-carrying capacity. Braking duties are handled by ventilated disc brakes on all four wheels, with larger rotors and calipers compared to lighter-duty Silverado models. An Anti-lock Braking System (ABS) is standard. The steering system utilizes a hydraulic power steering setup, providing a responsive and predictable feel.
Market Reception & Comparison
The Silverado 2500 HD with the 6.6-liter Duramax and Allison transmission has consistently received positive reviews for its towing capacity, reliability, and overall performance. Critics praise the engine’s robust power delivery and the transmission’s smooth operation. Fuel economy, while not a primary focus for this type of vehicle, is competitive within the heavy-duty truck segment. Compared to the gasoline-powered Silverado 2500 HD variants, the Duramax diesel offers superior towing capability and fuel efficiency when hauling heavy loads. However, the diesel variant carries a higher initial cost and potentially higher maintenance expenses. Compared to the Ford Super Duty and Ram Heavy Duty trucks, the Silverado 2500 HD is often seen as a strong all-around performer, offering a balance of capability, comfort, and value.
Legacy
The L5P Duramax engine has established a reputation for long-term reliability and durability. Properly maintained, these engines can accumulate hundreds of thousands of miles. The Allison 10-speed automatic transmission has also proven to be a robust and dependable component. In the used car market, Silverado 2500 HD models equipped with this powertrain combination hold their value well, reflecting their strong reputation and continued demand. The combination of the Duramax diesel and Allison transmission remains a popular choice for buyers seeking a capable and reliable heavy-duty pickup truck.
