The Chevrolet Silverado 3500 HD II, specifically the Crew Cab Long Box configuration with the 6.6-liter Duramax Turbo Diesel V8 engine producing 397 horsepower and paired with an Allison automatic transmission, represents a significant iteration of Chevrolet’s heavy-duty pickup truck lineage. Produced from 2011 to 2014, this variant falls within the GMT900 platform’s facelifted generation, offering a blend of robust capability, improved refinement, and diesel-specific features aimed at the demanding needs of commercial users and those requiring substantial towing and hauling capacity. This particular trim level occupied a premium position within the 3500 HD lineup, offering a balance between work-focused utility and comfortable passenger accommodations.
Technical Specifications
| Brand | Chevrolet |
| Model | Silverado 3500 HD |
| Generation | Silverado 3500 HD II (GMT900, facelift 2011) Crew Cab Long Box |
| Type (Engine) | 6.6 Duramax TD V8 (397 Hp) SRW Automatic |
| Start of production | 2011 |
| End of production | 2014 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 5 |
| Doors | 4 |
| Fuel Type | Diesel |
| Weight-to-power ratio | 8.2 kg/Hp, 122.7 Hp/tonne |
| Weight-to-torque ratio | 3.1 kg/Nm, 320.5 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) |
| Maximum engine speed | 3000 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 | 24 l (25.36 US qt | 21.12 UK qt) |
| Kerb Weight | 3236 kg (7134.16 lbs.) |
| Max. weight | 5307 kg (11699.93 lbs.) |
| Max load | 2071 kg (4565.77 lbs.) |
| Trunk (boot) space – maximum | 2138 l (75.5 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 | 6581 mm (259.09 in.) |
| Width including mirrors | 2436 mm (95.91 in.) |
| Height | 1979 mm (77.91 in.) |
| Wheelbase | 4260 mm (167.72 in.) |
| Front track | 1748 mm (68.82 in.) |
| Rear (Back) track | 1709 mm (67.28 in.) |
| Ride height (ground clearance) | 216 mm (8.5 in.) |
| Minimum turning circle (turning diameter) | 16.7 m (54.79 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, 355×40 mm |
| Rear brakes | Ventilated discs, 373×34 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 | 6.5J x 17; 8J x 18 |
INTRODUCTION
The 2011-2014 Chevrolet Silverado 3500 HD II, in its Crew Cab Long Box configuration with the 6.6L Duramax diesel, represented a significant upgrade over its predecessor. Built on the GMT900 platform, this generation benefited from a substantial redesign in 2011, focusing on improved interior refinement, enhanced towing capabilities, and increased diesel engine output. The Duramax engine, a cornerstone of the Silverado HD’s appeal, was further refined with the LML variant, offering increased horsepower and torque. This particular combination was targeted towards buyers needing a heavy-duty truck for both work and family use, offering the space of a crew cab with the power to handle demanding tasks. It competed directly with Ford’s Super Duty and Ram’s heavy-duty offerings.
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 crankshaft designed for high torque output. The LML iteration of the Duramax introduced several improvements over previous versions, including a redesigned turbocharger, improved fuel injectors, and a more efficient cooling system, resulting in the 397 horsepower and 1037 lb-ft of torque. The engine utilizes a diesel common rail fuel injection system, delivering highly pressurized fuel directly into the cylinders for optimal combustion. The overhead valve (OHV) valvetrain, while traditional, is known for its durability and simplicity. The Allison 6-speed automatic transmission is a critical component, specifically engineered to handle the immense torque produced by the Duramax engine. This transmission features a lock-up torque converter for improved fuel efficiency and a heavy-duty design for reliability under demanding conditions. The transmission’s gear ratios are optimized for both towing and everyday driving, providing a balance between power and efficiency.
Driving Characteristics
The Silverado 3500 HD with the 6.6L Duramax and Allison automatic delivers a driving experience that prioritizes capability and stability over outright sportiness. The sheer torque output of the engine is immediately apparent, providing effortless acceleration even when heavily loaded. The Allison transmission shifts smoothly and decisively, contributing to a refined driving experience. While not as quick as gasoline-powered trucks, the Duramax offers a unique power delivery characteristic, with peak torque available at relatively low RPMs (1600 rpm). This makes it ideal for towing and hauling, allowing the truck to maintain speed and control even on steep inclines. Compared to the 6.0L gasoline V8 offered in the Silverado HD, the Duramax provides significantly more torque and better fuel economy, especially when towing. However, it also comes with a higher initial cost and potentially higher maintenance expenses. Compared to manual transmission equipped Duramax models, the automatic offers convenience and ease of use, but some drivers may prefer the greater control offered by a manual gearbox.
Equipment & Trim Levels
The Crew Cab Long Box configuration of the Silverado 3500 HD typically came well-equipped, even in its base trim. Standard features included air conditioning, power windows and locks, a tilt steering wheel, and a basic audio system. Higher trim levels, such as LT and LTX, added features like leather upholstery, heated seats, a premium audio system, navigation, and a rear vision camera. The interior design focused on functionality and durability, with large, easy-to-use controls and comfortable seating. Optional extras included a sunroof, upgraded wheels, and various towing packages. The Crew Cab configuration provided ample space for passengers, making it a comfortable option for families or crews. The Long Box bed offered a generous amount of cargo space, further enhancing the truck’s versatility.
Chassis & Braking
The Silverado 3500 HD’s chassis is built for heavy-duty use, featuring a fully boxed frame and robust suspension components. The front suspension utilizes an independent torsion bar setup with double wishbones, providing a comfortable ride and good handling. The rear suspension employs a traditional leaf spring design, optimized for load-carrying capacity. The braking system consists of ventilated discs on all four wheels, providing ample stopping power even when heavily loaded. An Anti-lock Braking System (ABS) is standard, enhancing safety and control. The steering system utilizes a cone worm with recirculation balls, offering precise and responsive steering. Tire sizes varied depending on the trim level, with options ranging from 235/80 R17 to 265/70 R18.
Market Reception & Comparison
The 2011-2014 Chevrolet Silverado 3500 HD with the Duramax diesel received generally positive reviews from critics. The engine was praised for its power and efficiency, while the Allison transmission was lauded for its smooth operation and durability. The improved interior refinement and enhanced towing capabilities were also well-received. However, some critics noted that the ride quality could be firm, especially when unloaded. Compared to the Ford Super Duty and Ram Heavy Duty trucks, the Silverado 3500 HD offered a competitive combination of features, performance, and value. Fuel economy was generally comparable to its rivals, with the Duramax diesel offering a significant advantage over gasoline-powered engines. Reliability was generally good, although some owners reported issues with the emissions control system.
Legacy
The Duramax LML engine and Allison transmission combination in the 2011-2014 Silverado 3500 HD has proven to be a durable and reliable powertrain. These trucks continue to be popular in the used car market, commanding relatively high prices due to their capability and longevity. The Duramax engine is known for its ability to accumulate high mileage with proper maintenance. While the emissions control system can be a potential source of issues, the engine itself is generally considered to be very robust. These trucks remain a popular choice for those needing a heavy-duty pickup for work or recreational purposes, offering a blend of power, reliability, and comfort.
