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) 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 | 7.1 kg/Hp, 140.8 Hp/tonne |
| Weight-to-torque ratio | 2.6 kg/Nm, 390.4 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 | 3161 kg (6968.81 lbs.) |
| Max. weight | 4785 kg (10549.12 lbs.) |
| Max load | 1624 kg (3580.31 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 | 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 |
| 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 |
The Chevrolet Silverado 2500 HD IV, specifically the Regular Cab Long Bed configuration with the 6.6L Duramax diesel and Allison automatic, debuted in 2020 as part of the fourth generation (T1XX platform) of Chevrolet’s heavy-duty truck lineup. This generation represented a significant overhaul, focusing on increased capability, improved interior refinement, and advanced technology. The Regular Cab/Long Bed combination was aimed at customers prioritizing maximum cargo space and towing capacity over passenger comfort, making it popular with tradespeople, farmers, and those frequently hauling large loads. This variant offered a robust solution for demanding tasks, solidifying Chevrolet’s position in the competitive heavy-duty truck market.
Powertrain & Engine Architecture
At the heart of this Silverado 2500 HD lies the Duramax L5P 6.6-liter turbocharged diesel V8 engine. This engine is a cornerstone of Chevrolet’s heavy-duty offerings, known for its durability and substantial torque output. The L5P utilizes a cast iron block, aluminum cylinder heads, and a robust forged crankshaft. Fuel is delivered via a high-pressure common rail direct injection system, optimized for efficient combustion and reduced emissions. The turbocharger, coupled with an intercooler, provides increased air intake, boosting power and torque. The engine features an overhead valve (OHV) valvetrain, a design choice prioritizing low-end torque and reliability. The Allison 10-speed automatic transmission is specifically tuned to handle the engine’s immense torque, providing smooth and efficient power delivery. This transmission features electronically controlled shifts and a tow/haul mode for optimized performance when towing heavy loads.
Driving Characteristics
The 445 horsepower and 910 lb-ft of torque produced by this combination translate into impressive real-world performance. While not as quick accelerating as gasoline-powered counterparts, the Duramax/Allison setup excels in towing and hauling. The 10-speed Allison transmission’s closely spaced gear ratios keep the engine within its optimal power band, even when navigating hills or carrying heavy loads. The gear ratios are optimized for both low-end grunt and highway cruising efficiency. Compared to the 6.6L gasoline engine option, the diesel offers significantly more torque, making it the preferred choice for demanding applications. Compared to higher-output Duramax variants, this 445hp version provides a balance between power and fuel economy, making it suitable for those who don’t require the absolute maximum towing capacity.
Equipment & Trim Levels
The Silverado 2500 HD Regular Cab Long Bed with the Duramax diesel typically came standard with features geared towards work-truck functionality. This included vinyl or cloth seating, a basic infotainment system with a touchscreen display, and essential safety features like ABS and stability control. Higher trim levels, such as the LT and LTZ, added features like leather upholstery, heated and ventilated seats, a premium audio system, and advanced driver-assistance technologies like lane departure warning and automatic emergency braking. Optional extras included a gooseneck hitch, bed liner, and various towing packages to further enhance the truck’s capabilities. The interior, while functional, prioritized durability and ease of cleaning over luxury.
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 wishbone components, providing a comfortable ride and stable 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 heavily loaded. The front brakes measure 355x40mm, while the rear brakes are 360x34mm. An Anti-lock Braking System (ABS) is standard, enhancing safety and control during emergency braking situations. Steering is accomplished via a hydraulic power steering system, offering a responsive and predictable feel.
Market Reception & Comparison
The Silverado 2500 HD with the Duramax diesel and Allison automatic received generally positive reviews from automotive critics. It was praised for its impressive towing capacity, robust powertrain, and comfortable ride quality. Fuel economy, while not exceptional, was considered reasonable for a heavy-duty truck. Compared to the gasoline-powered Silverado 2500 HD, the diesel variant offered significantly better fuel economy when towing heavy loads. Compared to competitors like the Ford Super Duty and Ram 2500, the Silverado 2500 HD was often seen as a strong contender, offering a compelling combination of capability, comfort, and value. Some critics noted the interior design wasn’t as modern as some competitors, but the overall functionality and durability were highly regarded.
Legacy
The Duramax L5P engine and Allison 10-speed automatic transmission have proven to be exceptionally reliable powertrains. Well-maintained examples of the 2020-2023 Silverado 2500 HD with this configuration continue to command strong resale values in the used car market. The engine is known for its longevity, with many units exceeding 200,000 miles without major issues. Regular maintenance, including oil changes and fuel filter replacements, is crucial for ensuring long-term reliability. This particular variant remains a popular choice for buyers seeking a capable and dependable heavy-duty truck, solidifying its place as a workhorse in the American automotive landscape.
