The Chevrolet Silverado 3500 HD III, specifically the Crew Cab Long Box configuration with the 6.6-liter Duramax Turbo Diesel V8 engine producing 445 horsepower, represents a significant iteration in Chevrolet’s heavy-duty truck lineage. Produced from 2017 to 2019 as part of the K2XX platform generation, this variant was aimed squarely at buyers needing substantial towing and hauling capability combined with a degree of interior comfort. It occupied the upper echelon of the Silverado 3500 HD lineup, positioned as a premium offering for those prioritizing power and durability over fuel economy.
Technical Specifications
| Brand | Chevrolet |
| Model | Silverado 3500 HD |
| Generation | Silverado 3500 HD III (K2XX) Crew Cab Long Box |
| Type (Engine) | 6.6 Duramax TD V8 (445 Hp) 4WD SRW Automatic |
| Start of production | 2017 |
| End of production | 2019 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 5 |
| Doors | 4 |
| Fuel Type | Diesel |
| Weight-to-power ratio | 7.9 kg/Hp, 126.9 Hp/tonne |
| Weight-to-torque ratio | 2.8 kg/Nm, 351.9 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 | 3507 kg (7731.61 lbs.) |
| Max. weight | 5262 kg (11600.72 lbs.) |
| Max load | 1755 kg (3869.11 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%) | 6804 kg (15000.25 lbs.) |
| Length | 6563 mm (258.39 in.) |
| Width including mirrors | 2045 mm (80.51 in.) |
| Height | 1983 mm (78.07 in.) |
| Wheelbase | 4259 mm (167.68 in.) |
| Front track | 1748 mm (68.82 in.) |
| Rear (Back) track | 1709 mm (67.28 in.) |
| Minimum turning circle (turning diameter) | 17.1 m (56.1 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, 360 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 Crew Cab Long Box with the 6.6L Duramax diesel and Allison automatic transmission was a cornerstone of Chevrolet’s heavy-duty truck offerings. Built on the K2XX platform, which debuted in 2014, this generation represented a significant step forward in terms of capability, refinement, and technology. The Crew Cab configuration provided ample passenger space, while the Long Box offered a generous cargo bed. This particular variant was designed to appeal to owners who frequently tow large trailers – boats, RVs, or construction equipment – and require a robust, reliable powertrain.
Powertrain & Engine Architecture
At the heart of this Silverado 3500 HD lies the Duramax L5P 6.6-liter turbocharged diesel V8. This engine is a testament to diesel engineering, featuring a cast iron block, aluminum cylinder heads, and a robust rotating assembly. The L5P utilizes a common-rail direct fuel injection system, delivering fuel at extremely high pressures for optimized combustion. The turbocharger, coupled with an intercooler, provides increased air density for enhanced power output. The engine produces 445 horsepower at 2800 rpm and a massive 910 lb-ft of torque at 1600 rpm. The Allison 1000 Series six-speed automatic transmission is specifically designed to handle the immense torque output of the Duramax engine. This transmission features a lock-up torque converter for improved efficiency and a heavy-duty cooling system to prevent overheating under demanding conditions. The transmission’s gear ratios are optimized for both towing and everyday driving, providing a balance of power and fuel economy.
Driving Characteristics
The Silverado 3500 HD with the Duramax/Allison combination delivers a driving experience that prioritizes capability and control. While not a sports truck, the ample torque allows for confident acceleration, even when heavily loaded. The Allison transmission shifts smoothly and decisively, providing seamless power delivery. Compared to the gasoline-powered Silverado 3500 HD models, the Duramax diesel offers significantly more low-end torque, making it ideal for towing. Compared to other diesel variants, like those with the older 6.6L Duramax, the L5P offered a substantial power increase. The automatic transmission, while convenient, doesn’t offer the same level of control as a manual transmission, but it simplifies operation for drivers who spend long hours behind the wheel. The ride quality, even unladen, is relatively comfortable for a heavy-duty truck, thanks to the well-tuned suspension.
Equipment & Trim Levels
The Silverado 3500 HD III Crew Cab Long Box 6.6 Duramax typically came standard with a comprehensive list of features. These included air conditioning, power windows and locks, a rearview camera, and a basic infotainment system. Higher trim levels, such as LTZ and High Country, added features like leather upholstery, heated and ventilated front seats, a premium audio system, and advanced safety technologies. Optional extras included a sunroof, navigation system, and a variety of towing packages. The interior design was functional and durable, with a focus on providing a comfortable and productive work environment.
Chassis & Braking
The Silverado 3500 HD features a robust chassis designed to withstand the stresses of heavy hauling and towing. The front suspension utilizes an independent torsion bar setup with double wishbones, while the rear suspension employs a traditional leaf spring design. This configuration provides a good balance of ride comfort and load-carrying capacity. Braking duties are handled by ventilated disc brakes on all four wheels. The front brakes measure 355x40mm, while the rear brakes are 360mm. An Anti-lock Braking System (ABS) is standard, enhancing safety and control during emergency braking situations. The steering system is a cone worm with recirculation balls, providing a solid and predictable feel.
Market Reception & Comparison
The Silverado 3500 HD with the Duramax/Allison combination received generally positive reviews from automotive critics. It was praised for its immense towing capacity, powerful engine, and comfortable ride. Fuel economy, however, was a common criticism, as is typical for heavy-duty diesel trucks. Compared to the gasoline-powered Silverado 3500 HD models, the Duramax diesel offered superior towing performance and fuel efficiency when towing heavy loads. Compared to competitors like the Ford Super Duty and Ram Heavy Duty, the Silverado 3500 HD was often seen as a strong contender, offering a compelling combination of capability, comfort, and value.
Legacy
The Duramax L5P engine and Allison 1000 transmission have proven to be exceptionally reliable powertrains. Well-maintained examples of the 2017-2019 Silverado 3500 HD continue to command strong resale values in the used car market. The L5P Duramax is known for its longevity and ability to withstand high mileage. Common maintenance items include regular oil changes, fuel filter replacements, and coolant flushes. The K2XX platform Silverado 3500 HD remains a popular choice for owners who need a capable and dependable heavy-duty truck, solidifying its place as a significant vehicle in Chevrolet’s history.
