The Chevrolet Silverado 3500 HD IV (T1XX) Crew Cab Standard Bed, equipped with the 6.6-liter Duramax V8 engine producing 445 horsepower, represents a significant iteration in Chevrolet’s heavy-duty truck lineage. Produced from 2020 to 2023, this variant occupied a premium position within the fourth generation (T1XX) Silverado HD lineup, catering to buyers requiring substantial towing and hauling capabilities without sacrificing everyday usability. This configuration, paired with a four-wheel-drive system and single rear wheels (SRW), was designed for demanding tasks, from commercial applications to recreational towing of large trailers.
Technical Specifications
| Brand | Chevrolet |
| Model | Silverado 3500 HD |
| Generation | Silverado 3500 HD IV (T1XX) Crew Cab Standard Bed |
| Type (Engine) | 6.6 Duramax V8 (445 Hp) 4WD SRW 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 | 8 kg/Hp, 124.5 Hp/tonne |
| Weight-to-torque ratio | 2.9 kg/Nm, 345.4 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 | 3573 kg (7877.12 lbs.) |
| Max. weight | 5489 kg (12101.17 lbs.) |
| Max load | 1916 kg (4224.06 lbs.) |
| Trunk (boot) space – maximum | 1970 l (69.57 cu. ft.) |
| Fuel tank capacity | 136 l (35.93 US gal | 29.92 UK gal) |
| Permitted trailer load with brakes (12%) | 9662 kg (21301.06 lbs.) |
| Length | 6349 mm (249.96 in.) |
| Width including mirrors | 2079 mm (81.85 in.) |
| Height | 2054 mm (80.87 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) | 284 mm (11.18 in.) |
| Drivetrain Architecture | All wheel drive (4×4). Internal Combustion engine. |
| 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 | 265/70 R17; 245/75 R17; 275/70 R18 |
| Wheel rims size | 7.5J x 17; 8J x 18 |
INTRODUCTION
The 2020-2023 Chevrolet Silverado 3500 HD IV, specifically the Crew Cab Standard Bed configuration with the 6.6L Duramax diesel and 10-speed Allison automatic, represented a significant upgrade over previous generations. Built on the T1XX platform, this truck aimed to provide a blend of heavy-duty capability, improved refinement, and modern technology. It slotted into the Silverado HD range as a premium offering, positioned above the gasoline-powered variants and below the fully-loaded High Country trim. The “IV” designation denotes the fourth generation of the Silverado HD series.
Powertrain & Engine Architecture
At the heart of this Silverado 3500 HD lies the Duramax L5P 6.6-liter V8 diesel engine. This engine is a turbocharged, overhead valve (OHV) design, known for its robust construction and longevity. The L5P utilizes a diesel commonrail fuel injection system, delivering highly pressurized fuel directly into the cylinders for efficient combustion. A variable geometry turbocharger (VGT) and intercooler work in tandem to maximize power and torque across a broad RPM range. The engine produces 445 horsepower at 2800 rpm and a substantial 910 lb-ft (1234 Nm) of torque at 1600 rpm.
The engine is mated to a 10-speed Allison automatic transmission, a crucial component in harnessing the Duramax’s power. This transmission features electronically controlled shifts and a wide gear ratio spread, optimizing both towing performance and fuel efficiency. The Allison 10L1000 transmission is known for its durability and smooth operation, even under heavy loads. The transmission’s programming is specifically tuned to work with the characteristics of the Duramax engine, providing responsive acceleration and confident pulling power.
Driving Characteristics
The Silverado 3500 HD with the Duramax/Allison combination delivers a driving experience markedly different from its gasoline counterparts. The immense torque available from low RPMs allows for effortless towing and hauling, even with substantial payloads. While not a sports truck, the 10-speed transmission keeps the engine in its optimal power band, providing adequate acceleration for everyday driving. Compared to the 6.6L gasoline engine, the Duramax offers significantly more low-end grunt, making it ideal for demanding tasks. Compared to older Duramax engines with 6-speed transmissions, the 10-speed Allison provides closer gear ratios, resulting in smoother shifts and improved fuel economy. The ride quality, while still truck-like, is improved thanks to suspension tuning and the added weight of the diesel engine.
Equipment & Trim Levels
The Crew Cab Standard Bed configuration offered a spacious interior with seating for five passengers. Standard features typically included a Chevrolet Infotainment 3 system with a touchscreen display, Apple CarPlay and Android Auto compatibility, and a rearview camera. Higher trim levels added features such as leather upholstery, heated and ventilated front seats, a premium audio system, and advanced safety technologies like automatic emergency braking and lane departure warning. The Silverado 3500 HD also offered a range of optional extras, including a power sunroof, a navigation system, and a bed liner.
Chassis & Braking
The Silverado 3500 HD features a fully boxed frame, providing a solid foundation for heavy-duty applications. The front suspension utilizes an independent torsion bar setup with double wishbones, 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 truck’s robust chassis and braking system are designed to handle the substantial weight and loads associated with heavy-duty towing and hauling.
Market Reception & Comparison
The 2020-2023 Silverado 3500 HD with the Duramax/Allison combination received generally positive reviews from automotive critics. The engine was praised for its power and torque, while the 10-speed transmission was lauded for its smoothness and efficiency. Fuel economy, while not exceptional, was considered competitive for a heavy-duty diesel truck. Compared to the Ford Super Duty and Ram HD trucks, the Silverado 3500 HD offered a compelling combination of capability, refinement, and value. Some critics noted that the interior design was not as luxurious as some competitors, but the overall functionality and practicality were well-received.
Legacy
The Duramax L5P engine and Allison 10-speed transmission have proven to be a reliable and durable powertrain combination. These trucks have maintained strong resale values in the used car market, reflecting their reputation for dependability and capability. While diesel engines require more diligent maintenance than gasoline engines, the Duramax L5P has a track record of longevity when properly maintained. The 2020-2023 Silverado 3500 HD IV represents a high point in Chevrolet’s heavy-duty truck offerings, providing a capable and refined platform for demanding users.
