The Chevrolet Silverado 2500HD III (K2XX) Crew Cab Standard Box, equipped with the 6.6-liter Duramax Turbo Diesel V8 engine producing 445 horsepower and paired with an Allison automatic transmission, represents a significant iteration in Chevrolet’s heavy-duty truck lineage. Produced from 2017 to 2019, this configuration occupied a premium position within the Silverado 2500HD lineup, targeting buyers requiring substantial towing and hauling capabilities without sacrificing everyday usability. It was part of the third generation of the K2XX platform, known for its increased strength and refinement compared to its predecessors.
Technical Specifications
| Brand | Chevrolet |
| Model | Silverado 2500 HD |
| Generation | Silverado 2500 HD III (K2XX) Crew Cab Standard Box |
| Type (Engine) | 6.6 TD V8 (445 Hp) 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 | 7.3 kg/Hp, 136.8 Hp/tonne |
| Weight-to-torque ratio | 2.6 kg/Nm, 379.3 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 | 29.7 l (31.38 US qt | 26.13 UK qt) |
| Kerb Weight | 3253 kg (7171.64 lbs.) |
| Max. weight | 4536 kg (10000.17 lbs.) |
| Max load | 1283 kg (2828.53 lbs.) |
| Trunk (boot) space – maximum | 1728 l (61.02 cu. ft.) |
| Fuel tank capacity | 136 l (35.93 US gal | 29.92 UK gal) |
| Permitted trailer load with brakes (12%) | 5897 kg (13000.66 lbs.) |
| Length | 6083 mm (239.49 in.) |
| Width including mirrors | 2045 mm (80.51 in.) |
| Height | 1988 mm (78.27 in.) |
| Wheelbase | 3904 mm (153.7 in.) |
| Front track | 1748 mm (68.82 in.) |
| Rear (Back) track | 1709 mm (67.28 in.) |
| Minimum turning circle (turning diameter) | 15.7 m (51.51 ft.) |
| Drivetrain Architecture | Rear wheel drive |
| 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, 350×40 mm |
| Rear brakes | Ventilated discs, 360×34 mm |
| Tires size | 235/80 R17; 265/70 R18; 275/65 R18; 265/60 R20 |
| Wheel rims size | 7.5J x 17; 8J x 18; 8.5J x 20 |
INTRODUCTION
The 2017-2019 Chevrolet Silverado 2500HD Crew Cab 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, this generation represented a move towards increased capability and refinement. The Crew Cab configuration provided ample passenger space, while the standard box offered a practical cargo bed length. This particular variant was positioned as a premium offering, appealing to customers who needed a powerful and capable truck for work or recreational towing, but also desired a comfortable and well-equipped interior.
Powertrain & Engine Architecture
At the heart of this Silverado 2500HD lies the Duramax L5P 6.6-liter turbocharged diesel V8 engine. This engine is a testament to modern diesel technology, featuring a cast iron block, aluminum cylinder heads, and a robust rotating assembly. The L5P utilizes a diesel commonrail fuel injection system, delivering highly pressurized fuel directly into the cylinders for efficient combustion. The turbocharger, coupled with an intercooler, provides increased air intake, boosting power and torque. The engine produces 445 horsepower at 2800 rpm and a massive 910 lb-ft (1234 Nm) 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 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 responsiveness.
Driving Characteristics
The Silverado 2500HD 6.6L Diesel Automatic delivers a driving experience characterized by immense pulling power and a surprisingly comfortable ride for a heavy-duty truck. The Allison transmission shifts smoothly and efficiently, providing seamless power delivery. While not a sports truck, the 445 horsepower provides adequate acceleration for merging onto highways and passing other vehicles. The real strength of this powertrain lies in its ability to tow and haul heavy loads. The high torque output allows for effortless towing of large trailers, and the truck remains remarkably stable even when fully loaded. Compared to the gasoline-powered Silverado 2500HD models, the diesel offers significantly more torque and better fuel economy when towing. The automatic transmission, while convenient, doesn’t offer the same level of control as a manual transmission, but it simplifies operation for most drivers.
Equipment & Trim Levels
The Silverado 2500HD Crew Cab Standard Box 6.6L Diesel Automatic 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 with a touchscreen display. Higher trim levels, such as the LTZ and High Country, added features like leather upholstery, heated and ventilated front seats, a premium sound system, and advanced safety technologies like lane departure warning and forward collision alert. 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 practical cabin for both work and family use.
Chassis & Braking
The K2XX platform chassis of the Silverado 2500HD is designed for strength and durability. The front suspension features an independent torsion bar setup with double wishbones, providing a comfortable ride and good handling. The rear suspension utilizes a rigid axle with leaf springs, optimized for carrying heavy loads. The braking system consists of ventilated discs on all four wheels, providing ample stopping power. The front brakes measure 350x40mm, while the rear brakes are 360x34mm. An Anti-lock Braking System (ABS) is standard, enhancing safety and control during emergency braking situations.
Market Reception & Comparison
The Silverado 2500HD 6.6L Diesel Automatic was generally well-received by critics and consumers alike. It was praised for its powerful engine, smooth transmission, and comfortable ride. Compared to its competitors, such as the Ford Super Duty and Ram 2500, the Silverado 2500HD offered a competitive combination of capability, refinement, and value. Fuel economy was a strong point for the diesel engine, especially when compared to the gasoline-powered alternatives. However, some critics noted that the interior design was not as luxurious as some of its competitors. 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 pairing in the 2017-2019 Silverado 2500HD has proven to be a durable and reliable powertrain. These trucks continue to hold their value in the used car market, and are sought after by buyers who need a capable and dependable heavy-duty truck. While modern heavy-duty trucks have continued to evolve with new technologies and features, the K2XX generation Silverado 2500HD remains a popular choice for those who appreciate its proven performance and rugged dependability. Regular maintenance, including oil changes and fuel filter replacements, is crucial for ensuring the long-term reliability of this powertrain.
