The Chevrolet Silverado 2500 HD IV (T1XX) Crew Cab Standard Bed, equipped with the 6.6-liter Duramax V8 engine producing 445 horsepower and paired with a 10-speed automatic transmission and four-wheel drive, represents a significant iteration in Chevrolet’s heavy-duty truck lineage. Produced from 2020 through 2023, this configuration occupied a premium position within the fourth generation (T1XX) Silverado 2500/3500 HD lineup, targeting buyers requiring substantial towing and hauling capabilities without sacrificing everyday usability. It was designed to compete directly with offerings from Ford (Super Duty) and Ram (Heavy Duty) in the North American market.
Technical Specifications
| Brand | Chevrolet |
| Model | Silverado 2500 HD |
| Generation | Silverado 2500 HD IV (T1XX) Crew Cab Standard Bed |
| Type (Engine) | 6.6 Duramax V8 (445 Hp) 4WD Automatic |
| Start of production | 2020 |
| End of production | 2023 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 5 |
| Doors | 4 |
| Fuel Type | Diesel |
| Weight-to-power ratio | 7.9 kg/Hp, 127.1 Hp/tonne |
| Weight-to-torque ratio | 2.8 kg/Nm, 352.4 Nm/tonne |
| Power | 445 Hp @ 2800 rpm |
| Power per litre | 67.4 Hp/l |
| Torque | 1234 Nm @ 1600 rpm (910.15 lb.-ft. @ 1600 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | Duramax 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 | 29.1 l (30.75 US qt | 25.6 UK qt) |
| Kerb Weight | 3502 kg (7720.59 lbs.) |
| Max. weight | 5058 kg (11150.98 lbs.) |
| Max load | 1556 kg (3430.39 lbs.) |
| Trunk (boot) space – maximum | 1968 l (69.5 cu. ft.) |
| Fuel tank capacity | 136 l (35.93 US gal | 29.92 UK gal) |
| Permitted trailer load with brakes (12%) | 8392 kg (18501.19 lbs.) |
| Length | 6349 mm (249.96 in.) |
| Width including mirrors | 2079 mm (81.85 in.) |
| Height | 2027 mm (79.8 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) | 257 mm (10.12 in.) |
| Drivetrain Architecture | All wheel drive (4×4). ICE drives rear wheels, front wheels engaged via clutch. |
| 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 |
| Wheel rims size | 7.5J x 17; 8J x 18 |
Powertrain & Engine Architecture
The heart of this Silverado 2500 HD variant is the Duramax L5P 6.6-liter V8 diesel engine. This engine, a staple in GM’s heavy-duty truck offerings for years, is characterized by its robust construction and high torque output. The L5P utilizes a cast iron block and aluminum cylinder heads, coupled with a diesel commonrail fuel injection system delivering fuel at extremely high pressures for efficient combustion. A single variable geometry turbocharger with an intercooler provides forced induction, contributing to both power and torque. The engine employs an overhead valve (OHV) valvetrain, a design choice prioritizing durability and low-end torque over high-revving performance. The 10-speed Allison automatic transmission, a significant upgrade from previous generations, is specifically tuned to handle the engine’s substantial torque and provide smooth, efficient shifting. This transmission features electronically controlled shifts and a wide gear ratio spread, optimizing performance for both towing and highway cruising.
Driving Characteristics
The 445 horsepower and 910 lb-ft of torque delivered by the Duramax engine and 10-speed Allison transmission translate into impressive real-world performance. While not designed for outright speed, this Silverado 2500 HD excels at towing and hauling heavy loads. The 10-speed transmission keeps the engine within its optimal power band, even when navigating hills or carrying substantial weight. Compared to gasoline-powered Silverado 2500 HD models, the diesel offers significantly more low-end torque, making it easier to start and maintain momentum with heavy trailers. Compared to the 6.6L gasoline engine, the Duramax provides a more relaxed driving experience when towing, reducing the need for frequent downshifts. The automatic transmission, while smooth, isn’t as engaging as a manual transmission, but it provides convenience and ease of use for most drivers.
Equipment & Trim Levels
The Silverado 2500 HD IV Crew Cab Standard Bed with the Duramax engine typically came in higher trim levels, such as LT, LTZ, and High Country. Standard features included air conditioning, power windows and locks, a touchscreen infotainment system with Apple CarPlay and Android Auto compatibility, and a rearview camera. Higher trims added features like leather upholstery, heated and ventilated front seats, a premium sound system, and advanced safety technologies such as lane departure warning and automatic emergency braking. Optional extras included a power sunroof, a navigation system, and a bed liner.
Chassis & Braking
The Silverado 2500 HD features a fully boxed frame designed for strength and rigidity. The front suspension utilizes 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 even when towing. The rear brakes are slightly larger than the front brakes. An anti-lock braking system (ABS) is standard. The steering system utilizes a hydraulic power steering setup, offering a responsive and predictable feel.
Market Reception & Comparison
The Duramax-equipped Silverado 2500 HD received generally positive reviews from automotive critics. The engine was praised for its power, torque, and refinement, while the 10-speed Allison transmission was lauded for its smooth shifting and efficiency. Fuel economy, while not a primary concern for heavy-duty truck buyers, was considered competitive within the segment. Compared to the gasoline-powered Silverado 2500 HD, the Duramax variant offered superior towing capacity and fuel efficiency, but at a higher initial cost. Reliability has been generally good, although some owners have reported issues with the diesel particulate filter (DPF) system.
Legacy
The 2020-2023 Silverado 2500 HD with the 6.6-liter Duramax engine and 10-speed Allison transmission represents a well-engineered and capable heavy-duty truck. On the used market, these trucks hold their value relatively well, particularly those in good condition with low mileage. The Duramax engine is known for its longevity and durability, making these trucks a popular choice for buyers seeking a reliable and powerful workhorse. The combination of a proven powertrain and a comfortable, well-equipped cabin ensures that this Silverado 2500 HD variant will remain a desirable option for years to come.
