The Chevrolet Silverado 2500 HD IV (T1XX) Regular Cab Long Bed, equipped with the 6.6-liter Duramax Turbo Diesel V8 engine producing 445 horsepower and paired with a 10-speed automatic transmission and four-wheel drive, was a key offering in Chevrolet’s heavy-duty truck lineup from the 2020 to 2023 model years. This configuration represented a robust, work-oriented variant within the fourth generation (T1XX) Silverado HD series, designed for demanding tasks like towing and hauling. It occupied a position between the lighter-duty Silverado 1500 and the even more capable Silverado 3500 HD, catering to customers needing substantial capability without the added expense of the 3500.
Technical Specifications
| Brand | Chevrolet |
| Model | Silverado 2500 HD |
| Generation | Silverado 2500 HD IV (T1XX) Regular Cab Long Bed |
| Type (Engine) | 6.6 Duramax TD V8 (445 Hp) 4WD Automatic |
| Start of production | 2020 |
| End of production | 2023 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 2 |
| Doors | 2 |
| Fuel Type | Diesel |
| Weight-to-power ratio | 7.4 kg/Hp, 134.7 Hp/tonne |
| Weight-to-torque ratio | 2.7 kg/Nm, 373.6 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 | 3303 kg (7281.87 lbs.) |
| Max. weight | 4944 kg (10899.65 lbs.) |
| Max load | 1641 kg (3617.79 lbs.) |
| Fuel tank capacity | 106 l (28 US gal | 23.32 UK gal) |
| Permitted trailer load with brakes (12%) | 6577 kg (14499.8 lbs.) |
| Length | 5982 mm (235.51 in.) |
| Width including mirrors | 2076 mm (81.73 in.) |
| Height | 2030 mm (79.92 in.) |
| Wheelbase | 3595 mm (141.54 in.) |
| Front track | 1731 mm (68.15 in.) |
| Rear (Back) track | 1736 mm (68.35 in.) |
| Ride height (ground clearance) | 259 mm (10.2 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 | 235/80 R17; 265/70 R17; 245/75 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 6.6-liter Duramax L5P turbo-diesel V8 engine. This engine, a staple of GM’s heavy-duty trucks, utilizes a cast iron block and aluminum cylinder heads. It employs a common-rail direct fuel injection system, delivering fuel at extremely high pressures for optimized combustion. The engine features an overhead valve (OHV) valvetrain, known for its durability and simplicity. A single variable geometry turbocharger with an intercooler provides increased power and efficiency. The 10-speed Allison automatic transmission, a robust unit designed to handle the engine’s substantial torque output, features electronically controlled shifts for smooth and efficient operation. This transmission offered closer gear ratios compared to previous generations, improving both acceleration and towing performance.
Driving Characteristics
The 445 horsepower and 910 lb-ft of torque delivered by the Duramax engine and 10-speed Allison transmission resulted in a truck capable of significant pulling power. While not as quick off the line as gasoline-powered alternatives, the Silverado 2500 HD excelled in situations requiring low-end grunt. The 10-speed transmission helped keep the engine in its optimal power band during towing, minimizing gear hunting and maximizing efficiency. Compared to the 6.0-liter gasoline V8 option, the Duramax offered substantially more torque, making it the preferred choice for heavy hauling. The ride quality, while typical for a heavy-duty truck, was reasonably comfortable, especially when unladen. The four-wheel-drive system provided enhanced traction in various conditions.
Equipment & Trim Levels
The Regular Cab Long Bed 2500 HD with the Duramax engine was typically offered in Work Truck (WT), LT, and High Country trim levels. The WT trim was the most basic, focusing on functionality and affordability, featuring vinyl upholstery, basic infotainment, and steel wheels. The LT trim added more comfort and convenience features, such as cloth upholstery, upgraded infotainment with a larger touchscreen, and alloy wheels. The High Country trim represented the pinnacle of luxury, offering leather upholstery, premium audio systems, and advanced safety features. Standard equipment across most trims included air conditioning, power windows and locks, and a rearview camera. Optional extras included a trailer brake controller, navigation system, and various driver-assistance technologies.
Chassis & Braking
The Silverado 2500 HD IV (T1XX) utilized a fully boxed, high-strength steel frame designed for rigidity and durability. The front suspension featured an independent torsion bar setup with double wishbones, while the rear suspension employed a traditional leaf spring configuration. This setup provided a balance between ride comfort and load-carrying capacity. Braking duties were handled by ventilated disc brakes on all four wheels, with larger rotors at the front. An Anti-lock Braking System (ABS) was standard. The steering system utilized a hydraulic power steering setup, providing 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. The 10-speed Allison transmission was also well-received for its smooth shifting and improved efficiency. Compared to the gasoline-powered Silverado 2500 HD, the Duramax offered significantly better fuel economy when towing heavy loads. However, the Duramax engine carried a higher price tag. Against competitors like the Ford Super Duty and Ram Heavy Duty, the Silverado 2500 HD was considered a competitive offering, with a strong emphasis on capability and durability.
Legacy
The Duramax L5P engine paired with the 10-speed Allison transmission has proven to be a reliable and durable powertrain. While some early models experienced issues with diesel particulate filters (DPF) and emissions systems, these were largely addressed through software updates and improved components. Today, well-maintained examples of the 2020-2023 Silverado 2500 HD with this powertrain command strong resale values in the used car market. The combination of power, capability, and relative reliability makes it a popular choice for buyers seeking a heavy-duty truck for work or recreational purposes. The L5P Duramax remains a highly regarded engine among truck enthusiasts and professionals alike.
