Technical Specifications
| Brand | Chevrolet |
| Model | Silverado 3500 HD |
| Generation | Silverado 3500 HD III (K2XX) Double Cab Long Box |
| Type (Engine) | 6.6 Duramax TD V8 (397 Hp) DRW Automatic |
| Start of production | 2015 |
| End of production | 2017 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 5 |
| Doors | 4 |
| Fuel Type | Diesel |
| Weight-to-power ratio | 8.6 kg/Hp, 116.3 Hp/tonne |
| Weight-to-torque ratio | 3.3 kg/Nm, 303.8 Nm/tonne |
| Power | 397 Hp @ 3000 rpm |
| Power per litre | 60.2 Hp/l |
| Torque | 1037 Nm @ 1600 rpm (764.85 lb.-ft. @ 1600 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | Duramax LML |
| Engine displacement | 6599 cm3 (402.7 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 | 22.4 l (23.67 US qt | 19.71 UK qt) |
| Kerb Weight | 3413 kg (7524.38 lbs.) |
| Max. weight | 5908 kg (13024.91 lbs.) |
| Max load | 2495 kg (5500.53 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 | 6321 mm (248.86 in.) |
| Width including mirrors | 2438 mm (95.98 in.) |
| Height | 1972 mm (77.64 in.) |
| Wheelbase | 4017 mm (158.15 in.) |
| Front track | 1748 mm (68.82 in.) |
| Rear (Back) track | 1906 mm (75.04 in.) |
| Ride height (ground clearance) | 213 mm (8.39 in.) |
| Minimum turning circle (turning diameter) | 16.1 m (52.82 ft.) |
| Drivetrain Architecture | Rear wheel drive. Internal Combustion engine. |
| 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 |
The 2015-2017 Chevrolet Silverado 3500 HD Double Cab Long Box, equipped with the 6.6-liter Duramax Turbo Diesel V8 engine and Allison automatic transmission, represented a significant iteration in Chevrolet’s heavy-duty truck lineage. Produced during this period, this variant occupied a premium position within the Silverado 3500 HD lineup, catering to buyers requiring substantial towing and hauling capabilities without sacrificing everyday usability. It was part of the third generation (K2XX platform) of the Silverado/Sierra HD trucks, known for their enhanced strength, refinement, and technology compared to previous generations.
Powertrain & Engine Architecture
At the heart of this Silverado 3500 HD lies the Duramax LML 6.6-liter turbocharged diesel V8 engine. This engine is a testament to diesel engineering, featuring a cast iron block, aluminum cylinder heads, and a robust rotating assembly. The LML generation of the Duramax introduced a revised turbocharger, improved fuel injection system, and enhanced exhaust gas recirculation (EGR) system for increased efficiency and reduced emissions. The engine utilizes a common-rail direct injection system, delivering fuel at extremely high pressures for optimal combustion. The overhead valve (OHV) valvetrain, while seemingly traditional, is known for its durability and simplicity. The Allison 1000 Series six-speed automatic transmission is a critical component, specifically engineered to handle the immense torque output of the Duramax engine. This transmission features a lock-up torque converter for improved fuel economy and a heavy-duty cooling system to prevent overheating under strenuous conditions.
Driving Characteristics
The combination of the 397 horsepower and 765 lb-ft of torque delivered a potent driving experience. While not designed for outright speed, the Silverado 3500 HD offered impressive acceleration, even when heavily loaded. The Allison transmission’s programming prioritized smooth shifts and maximized engine braking, making towing feel confident and controlled. Compared to the 6.0L gasoline V8 option, the Duramax diesel provided significantly more low-end torque, making it far superior for hauling heavy loads. The automatic transmission, while convenient, did result in a slight performance deficit compared to the available manual transmission, which allowed for more direct control over gear selection. However, the Allison’s smooth operation and reliability were highly valued by most owners.
Equipment & Trim Levels
The Silverado 3500 HD Double Cab Long Box with the Duramax engine typically came well-equipped, often falling into the LT or higher trim levels. Standard features included air conditioning, power windows and locks, a rearview camera, and a basic infotainment system. Higher trims added features like leather upholstery, heated and ventilated front seats, a premium audio system, navigation, and advanced safety technologies. Optional extras included a sunroof, upgraded wheels, and various towing packages. The interior design focused on functionality and durability, with comfortable seating and easy-to-use controls.
Chassis & Braking
The K2XX platform provided a solid foundation for the Silverado 3500 HD. The chassis featured a fully boxed frame constructed from high-strength steel, contributing to its impressive towing and payload capacities. The front suspension utilized an independent torsion bar setup with double wishbones, while the rear suspension employed a traditional leaf spring design. This configuration balanced ride comfort with load-carrying capability. Braking duties were handled by ventilated disc brakes on all four wheels, providing ample stopping power even when towing. An Anti-lock Braking System (ABS) was standard, enhancing safety and control. The Dual Rear Wheel (DRW) configuration, common with this engine option, further increased stability and payload capacity.
Market Reception & Comparison
The Silverado 3500 HD with the Duramax diesel and Allison automatic received generally positive reviews. Critics praised its powerful engine, smooth transmission, and impressive towing capabilities. Fuel economy, while not exceptional, was considered reasonable for a heavy-duty truck of its size and capability. Compared to competitors like the Ford Super Duty and Ram HD trucks, the Silverado 3500 HD was often lauded for its comfortable ride and refined interior. However, some reviewers noted that the Silverado’s styling was less aggressive than that of its rivals. Reliability was generally good, although some owners reported issues with the diesel particulate filter (DPF) system.
Legacy
The Duramax LML engine and Allison transmission pairing in the 2015-2017 Silverado 3500 HD has proven to be a durable and reliable powertrain. These trucks continue to hold their value in the used car market, particularly those that have been well-maintained. The LML Duramax is known for its longevity and relatively low maintenance costs, making it a popular choice among buyers seeking a capable and dependable heavy-duty truck. While newer Silverado HD models offer more advanced technology and features, the K2XX generation remains a respected and capable workhorse, representing a sweet spot between affordability, capability, and proven reliability.
