Technical Specifications
| Brand | Chevrolet |
| Model | Silverado 3500 HD |
| Generation | Silverado 3500 HD IV (T1XX) Regular Cab Long Bed |
| Type (Engine) | 6.6 Duramax TD V8 (445 Hp) DRW 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 | 7.6 kg/Hp, 131.9 Hp/tonne |
| Weight-to-torque ratio | 2.7 kg/Nm, 365.7 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 | 3374 kg (7438.4 lbs.) |
| Max. weight | 6350 kg (13999.35 lbs.) |
| Max load | 2976 kg (6560.96 lbs.) |
| Fuel tank capacity | 106 l (28 US gal | 23.32 UK gal) |
| Permitted trailer load with brakes (12%) | 16329 kg (35999.28 lbs.) |
| Length | 5982 mm (235.51 in.) |
| Width including mirrors | 2457 mm (96.73 in.) |
| Height | 2038 mm (80.24 in.) |
| Wheelbase | 3595 mm (141.54 in.) |
| Front track | 1731 mm (68.15 in.) |
| Rear (Back) track | 1905 mm (75 in.) |
| Ride height (ground clearance) | 266 mm (10.47 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, 355×40 mm |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Cone worm with recirculation balls |
| Power steering | Hydraulic Steering |
| Tires size | 275/70 R18; 275/65 R20 |
| Wheel rims size | 8J x 18; 8.5J x 20 |
The Chevrolet Silverado 3500 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 line. This generation represented a significant overhaul, focusing on increased capability, improved interior refinement, and advanced technology. The Dual Rear Wheel (DRW) configuration, with its wider stance and increased stability, was specifically designed for demanding applications like gooseneck and fifth-wheel trailer towing. This variant aimed to provide a robust and reliable work truck solution for professionals and enthusiasts alike.
Powertrain & Engine Architecture
At the heart of this Silverado 3500 HD lies the Duramax L5P 6.6-liter turbocharged diesel V8 engine. This engine is a cornerstone of Chevrolet’s heavy-duty lineup, renowned for its durability and torque output. The L5P utilizes a cast iron block, aluminum cylinder heads, and a robust crankshaft designed to withstand the stresses of heavy hauling. The engine employs a high-pressure common rail direct fuel injection system, delivering fuel directly into the cylinders for optimized combustion. The turbocharger, coupled with an intercooler, provides increased air intake, boosting power and efficiency. The valvetrain utilizes an overhead valve (OHV) configuration, known for its simplicity and reliability. Paired with the engine is the Allison 10-speed automatic transmission, a heavy-duty unit specifically engineered to handle the immense torque produced by the Duramax engine. This transmission features electronically controlled shifts and a lock-up torque converter for improved fuel economy and responsiveness.
Driving Characteristics
The 445 horsepower and 910 lb-ft of torque delivered by the Duramax engine and Allison transmission combination translate into impressive real-world performance. While not designed for outright speed, this Silverado 3500 HD excels at towing and hauling heavy loads. The ten-speed automatic transmission provides a wide range of gear ratios, allowing the engine to operate efficiently at various speeds and loads. The lower gears provide ample torque for starting and climbing hills with heavy trailers, while the higher gears contribute to relaxed highway cruising. Compared to gasoline-powered Silverado 3500 HD models, the diesel offers significantly more low-end torque, making it ideal for work applications. Compared to other diesel variants within the Silverado lineup, such as those with slightly lower horsepower ratings, this 445 hp version provides a noticeable increase in pulling power, particularly when fully loaded.
Equipment & Trim Levels
The Silverado 3500 HD IV in this configuration typically came standard with a work-oriented interior, featuring durable vinyl or cloth upholstery. Standard features included air conditioning, a basic infotainment system with a touchscreen display, and power windows and locks. The Regular Cab configuration prioritized functionality over luxury, offering a spacious interior for two occupants. Optional extras included leather upholstery, heated and ventilated front seats, a premium audio system, and advanced safety features like lane departure warning and automatic emergency braking. Trim levels varied, but this engine/transmission combination was often found in the LT and higher trims, offering a balance of features and capability.
Chassis & Braking
The Silverado 3500 HD IV utilizes a robust chassis designed to withstand the stresses of heavy-duty use. The front suspension features 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. The DRW configuration significantly enhances stability, particularly when towing. Braking duties are handled by ventilated disc brakes on all four wheels, providing ample stopping power even with heavy loads. An Anti-lock Braking System (ABS) is standard, enhancing safety and control. The steering system utilizes a hydraulic power steering setup, offering responsive and precise steering feel.
Market Reception & Comparison
The Silverado 3500 HD IV with the Duramax diesel and Allison automatic received generally positive reviews from automotive critics. The engine was praised for its power, torque, and durability, while the transmission was lauded for its smooth shifting and responsiveness. Fuel economy, while not exceptional, was considered reasonable for a heavy-duty truck of this size and capability. Compared to competing trucks from Ford and Ram, the Silverado 3500 HD was often seen as a strong contender, offering a compelling combination of performance, reliability, and value. The DRW configuration, while adding to the vehicle’s cost, was recognized as a significant advantage for those requiring maximum towing capacity.
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 3500 HD IV continue to command strong resale values in the used car market. The combination of robust construction, proven technology, and ample power makes this variant a desirable choice for buyers seeking a capable and dependable heavy-duty truck. The L5P Duramax engine, in particular, has earned a reputation for longevity, with many examples exceeding 200,000 miles without major issues, solidifying its place as a benchmark in the diesel truck segment.
