The Chevrolet Silverado 3500 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 Allison automatic transmission and four-wheel drive, represents a significant offering in the heavy-duty pickup truck segment. Produced from 2020 to 2023, this configuration catered to buyers needing substantial towing and hauling capabilities, particularly in the commercial and agricultural sectors. It falls within the fourth generation (T1XX) of the Silverado HD series, known for its increased strength and refinement over previous iterations.
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) 4WD 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 | 7.9 kg/Hp, 126.3 Hp/tonne |
| Weight-to-torque ratio | 2.9 kg/Nm, 350.3 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 | 3523 kg (7766.89 lbs.) |
| Max. weight | 6350 kg (13999.35 lbs.) |
| Max load | 2827 kg (6232.47 lbs.) |
| Fuel tank capacity | 106 l (28 US gal | 23.32 UK gal) |
| Permitted trailer load with brakes (12%) | 14406 kg (31759.79 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 | 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, 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 |
INTRODUCTION
The Chevrolet Silverado 3500 HD IV, specifically the Regular Cab Long Bed configuration with the 6.6L Duramax diesel and 10-speed Allison automatic, was positioned as a workhorse within the Silverado HD lineup. It targeted customers who prioritized maximum towing and payload capacity over passenger comfort or luxury features. The “IV” designation refers to the fourth generation of the Silverado HD series, introduced for the 2020 model year. Built on the T1XX platform, this generation focused on increasing interior space, improving ride quality, and enhancing overall capability. This particular variant, with its dual rear wheels (DRW), further amplified its towing prowess, making it a popular choice for those hauling heavy trailers, such as construction equipment, livestock, or large recreational vehicles.
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 truck offerings, renowned for its durability and torque output. The L5P utilizes a cast iron block and aluminum cylinder heads, featuring direct injection with a common rail fuel system capable of extremely high injection pressures. The engine employs an overhead valve (OHV) valvetrain, a design choice favored for its robustness and simplicity. A variable geometry turbocharger and intercooler work in concert to optimize power and efficiency across a wide range of operating conditions. The 10-speed Allison automatic transmission, a significant upgrade from previous generations, provides smooth and efficient power delivery. This transmission features electronically controlled shifts and a wide gear ratio spread, maximizing both towing performance and fuel economy. The transmission is designed to handle the immense torque produced by the Duramax engine.
Driving Characteristics
The 445 horsepower and, more importantly, the 1234 Nm (910.15 lb-ft) of torque delivered by the Duramax engine and 10-speed Allison transmission translate into exceptional towing and hauling capabilities. While not designed for outright speed, this configuration provides ample power for confidently navigating steep grades and accelerating with heavy loads. The 10-speed Allison transmission allows the engine to remain within its optimal power band more frequently, resulting in a more responsive driving experience compared to older transmissions. Compared to gasoline-powered Silverado 3500 HD models, the diesel offers significantly more low-end torque, making it ideal for demanding tasks. Compared to other diesel variants within the Silverado HD lineup, such as those with higher horsepower ratings, this configuration prioritizes a balance between power, fuel efficiency, and durability. The dual rear wheel setup enhances stability when towing heavy loads, reducing sway and improving overall control.
Equipment & Trim Levels
The Regular Cab Long Bed configuration typically represents the most basic trim level within the Silverado 3500 HD range. Standard features generally include air conditioning, a basic infotainment system with a touchscreen display, vinyl upholstery, and manual windows and locks. However, even in its base form, the truck offers essential features for work-oriented buyers. Optional extras could include upgraded infotainment systems with navigation, leather upholstery, power-adjustable seats, remote start, and various driver-assistance technologies. The Work Truck (WT) trim was a common starting point for this configuration, often seen with minimal frills focused on functionality. Higher trims, like the LT, added more comfort and convenience features.
Chassis & Braking
The Silverado 3500 HD IV features a fully boxed frame constructed from high-strength steel, providing a robust foundation for heavy-duty applications. The front suspension utilizes an independent torsion bar setup with double wishbone components, while the rear suspension employs a traditional leaf spring design. This combination provides a comfortable ride while maintaining excellent load-carrying capacity. Braking duties are handled by ventilated disc brakes on all four wheels, measuring 355×40 mm. An Anti-lock Braking System (ABS) is standard, enhancing safety and control during emergency braking situations. The hydraulic power steering system provides responsive and precise steering feel.
Market Reception & Comparison
The Silverado 3500 HD IV with the Duramax diesel and 10-speed Allison transmission received generally positive reviews from automotive critics. The engine was praised for its power and durability, while the transmission was lauded for its smooth shifting and wide gear ratio spread. Fuel economy, while not exceptional, was considered competitive for a heavy-duty truck of its size and capability. Compared to the gasoline-powered Silverado 3500 HD models, the diesel variant offered superior towing and hauling performance, albeit at a higher initial cost. Compared to competitors like the Ford Super Duty and Ram Heavy Duty, the Silverado 3500 HD was often seen as offering a good balance of capability, comfort, and value.
Legacy
The Duramax L5P engine and 10-speed Allison transmission have proven to be exceptionally reliable powertrains. Well-maintained examples of the 2020-2023 Silverado 3500 HD with this configuration continue to command strong resale values in the used car market. The engine’s robust construction and the transmission’s durability contribute to its long-term reliability. These trucks remain popular choices for buyers seeking a capable and dependable heavy-duty pickup for work or recreational purposes. The combination of power, towing capacity, and relative reliability has solidified this variant’s place as a workhorse in the American trucking landscape.
