The Chevrolet Silverado 3500 HD III (K2XX) Regular Cab Long Box, equipped with the 6.6-liter Duramax Turbo Diesel V8 engine producing 445 horsepower and paired with a 4WD Dual Rear Wheel (DRW) automatic transmission, was a heavy-duty pickup truck produced from 2017 to 2019. This variant represented a significant offering in Chevrolet’s lineup, targeting customers requiring substantial towing and hauling capabilities. It falls within the third generation of the K2XX Silverado HD platform, known for its increased strength and refinement over its predecessors.
Technical Specifications
| Brand | Chevrolet |
| Model | Silverado 3500 HD |
| Generation | Silverado 3500 HD III (K2XX) Regular Cab Long Box |
| Type (Engine) | 6.6 Duramax TD V8 (445 Hp) 4WD DRW Automatic |
| Start of production | 2017 |
| End of production | 2019 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 2 |
| Doors | 2 |
| Fuel Type | Diesel |
| Weight-to-power ratio | 7.6 kg/Hp, 131.1 Hp/tonne |
| Weight-to-torque ratio | 2.8 kg/Nm, 363.6 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 | 29.7 l (31.38 US qt | 26.13 UK qt) |
| Kerb Weight | 3394 kg (7482.49 lbs.) |
| Max. weight | 5908 kg (13024.91 lbs.) |
| Max load | 2514 kg (5542.42 lbs.) |
| Trunk (boot) space – maximum | 2162 l (76.35 cu. ft.) |
| Fuel tank capacity | 136 l (35.93 US gal | 29.92 UK gal) |
| Permitted trailer load with brakes (12%) | 9072 kg (20000.34 lbs.) |
| Length | 5699 mm (224.37 in.) |
| Width including mirrors | 2438 mm (95.98 in.) |
| Height | 1967 mm (77.44 in.) |
| Wheelbase | 3393 mm (133.58 in.) |
| Front track | 1748 mm (68.82 in.) |
| Rear (Back) track | 1906 mm (75.04 in.) |
| Minimum turning circle (turning diameter) | 14 m (45.93 ft.) |
| Drivetrain Architecture | All wheel drive (4×4). ICE drives rear wheels, front wheels engaged via clutch. |
| Number of gears and type of gearbox | 6 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 |
| Tires size | 235/80 R17; 265/70 R18 |
| Wheel rims size | 7.5J x 17; 8J x 18 |
INTRODUCTION
The 2017-2019 Chevrolet Silverado 3500 HD III Regular Cab Long Box with the 6.6L Duramax diesel and automatic transmission was positioned as a workhorse within the Silverado HD lineup. It catered to buyers needing maximum capability for demanding tasks like heavy towing, construction, and agricultural applications. The “III” designation refers to the third iteration of the K2XX platform, introduced in 2017, which brought improvements in chassis rigidity, interior refinement, and technology. The Regular Cab configuration, combined with the Long Box, prioritized cargo space and utility over passenger comfort, making it a popular choice for commercial users and those prioritizing function over form.
Powertrain & Engine Architecture
At the heart of this Silverado 3500 HD variant lies the Duramax L5P 6.6-liter turbocharged diesel V8 engine. This engine is a testament to diesel technology, featuring a cast iron block, aluminum cylinder heads, and a robust rotating assembly designed for high torque output. The L5P utilizes a Bosch common rail fuel injection system, delivering fuel at extremely high pressures for efficient combustion. The turbocharger, coupled with an intercooler, provides increased air density for enhanced power. The engine employs an overhead valve (OHV) valvetrain, a design choice favored for its durability and simplicity. The Allison 10-speed automatic transmission is a key component, 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 efficiency. The transmission’s gear ratios are optimized for both towing and everyday driving, providing a balance of power and economy.
Driving Characteristics
The Silverado 3500 HD with the Duramax and Allison automatic delivers a driving experience focused on capability rather than sportiness. The 445 horsepower and, more importantly, the 1234 Nm (910 lb-ft) of torque provide effortless pulling power, even when towing near its maximum capacity. The Allison transmission shifts smoothly and predictably, although it isn’t as quick-shifting as some modern transmissions. Compared to the 6.0L gasoline V8 option, the Duramax offers significantly more low-end torque, making it ideal for hauling heavy loads. While the gasoline engine might feel more responsive in everyday driving, the diesel’s superior torque makes it the clear choice for demanding tasks. Compared to manual transmission equipped Duramax models, the automatic provides ease of use, particularly in stop-and-go traffic or for drivers less familiar with manual transmissions. However, some drivers may prefer the greater control offered by a manual gearbox.
Equipment & Trim Levels
The Regular Cab Long Box configuration typically came with a more utilitarian interior compared to higher trim levels like the LTZ or High Country. Standard features generally included air conditioning, a basic infotainment system with a touchscreen display, vinyl upholstery, and power windows and locks. The dashboard layout was functional and straightforward, prioritizing ease of use. Optional extras included upgraded infotainment systems with navigation, leather upholstery, heated seats, a premium sound system, and various driver-assistance features like parking sensors and a rearview camera. The work truck (WT) trim was the most basic, while the LT trim added some additional comfort and convenience features.
Chassis & Braking
The K2XX chassis of the Silverado 3500 HD is designed for exceptional strength and durability. The frame is fully boxed and constructed from high-strength steel. The front suspension utilizes an independent torsion bar setup with double wishbone control arms, providing a comfortable ride while maintaining stability. The rear suspension employs a traditional leaf spring design, optimized for heavy load carrying. Braking duties are handled by ventilated disc brakes on all four wheels, providing ample stopping power even when heavily loaded. An Anti-lock Braking System (ABS) is standard. The Dual Rear Wheel (DRW) configuration significantly increases stability and load-carrying capacity compared to single rear wheel models.
Market Reception & Comparison
The Silverado 3500 HD with the Duramax diesel and Allison automatic received generally positive reviews from automotive critics. It was praised for its immense towing and hauling capabilities, comfortable ride (for a heavy-duty truck), and refined interior (compared to previous generations). Fuel economy, while not a primary concern for buyers in this segment, was considered respectable for a vehicle of this size and capability. Compared to the Ford Super Duty and Ram Heavy Duty trucks, the Silverado 3500 HD was often seen as offering a good balance of capability, comfort, and value. Reliability was generally good, although diesel engines can be more expensive to maintain than gasoline engines due to the complexity of the fuel injection system and emissions controls.
Legacy
The Duramax L5P engine and Allison transmission combination has proven to be exceptionally durable and reliable. These trucks continue to hold their value well in the used car market, particularly those that have been well-maintained. The 2017-2019 Silverado 3500 HD represents a significant step forward in heavy-duty truck technology, offering a compelling combination of power, capability, and refinement. The L5P Duramax engine remains a highly sought-after powerplant, known for its longevity and ability to withstand demanding use. These trucks are still commonly seen on job sites and highways today, a testament to their enduring quality and capability.
