The Chevrolet Silverado 2500HD II, specifically the facelifted version produced from 2011 to 2014, represented a significant evolution in Chevrolet’s heavy-duty truck lineup. This iteration, based on the GMT900 platform, catered to the growing demand for capable and powerful work trucks in the North American market. The Regular Cab Long Box configuration, paired with the 6.6-liter Duramax Turbo Diesel V8 engine producing 397 horsepower and coupled to a 6-speed Allison automatic transmission, was a popular choice for those needing substantial towing and hauling capacity. This particular variant occupied a sweet spot in the lineup, offering a balance between capability, comfort, and cost, appealing to both commercial users and private owners requiring serious truck performance.
Technical Specifications
| Brand | Chevrolet |
| Model | Silverado 2500 HD |
| Generation | Silverado 2500 HD II (GMT900, facelift 2011) Regular Cab Long Box |
| Type (Engine) | 6.6 Duramax TD V8 (397 Hp) 4WD Automatic |
| Start of production | 2011 |
| End of production | 2014 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 2 |
| Doors | 2 |
| Fuel Type | Diesel |
| Weight-to-power ratio | 7.8 kg/Hp, 128.3 Hp/tonne |
| Weight-to-torque ratio | 3 kg/Nm, 335.2 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 | 3094 kg (6821.1 lbs.) |
| Max. weight | 4491 kg (9900.96 lbs.) |
| Max load | 1397 kg (3079.86 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 | 5715 mm (225 in.) |
| Width including mirrors | 2032 mm (80 in.) |
| Height | 1971 mm (77.6 in.) |
| Wheelbase | 3369 mm (132.64 in.) |
| Front track | 1748 mm (68.82 in.) |
| Rear (Back) track | 1709 mm (67.28 in.) |
| Ride height (ground clearance) | 231 mm (9.09 in.) |
| Minimum turning circle (turning diameter) | 13.7 m (44.95 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, 350×40 mm |
| Rear brakes | Ventilated discs, 360×34 mm |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Cone worm with recirculation balls |
| Tires size | 245/75 R17; 265/70 R17; 265/70 R18; 265/60 R20 |
| Wheel rims size | 7.5J x 17; 8J x 18; 8.5J x 20 |
Powertrain & Engine Architecture
The heart of this Silverado 2500HD variant is the Duramax LML 6.6-liter turbocharged diesel V8. This engine represented a significant upgrade over its predecessor, the LBZ, focusing on increased efficiency and reduced emissions while maintaining robust power output. The LML utilized a common-rail fuel injection system, delivering highly pressurized fuel directly into the cylinders for optimized combustion. The engine featured an overhead valve (OHV) valvetrain, a design choice favored for its durability and simplicity in heavy-duty applications. A variable geometry turbocharger and intercooler worked in tandem to maximize power and torque across a broad RPM range. The Allison 1000 6-speed automatic transmission was specifically designed to handle the immense torque produced by the Duramax engine. This transmission featured a lock-up torque converter for improved fuel efficiency at highway speeds and heavy-duty internal components for reliability under demanding conditions.
Driving Characteristics
The 6.6L Duramax with the Allison automatic provided a surprisingly refined driving experience for a heavy-duty truck. While not designed for outright speed, the 397 horsepower and, more importantly, the 1037 lb-ft of torque, delivered exceptional pulling power. Acceleration was brisk, especially when unloaded, and the Allison transmission shifted smoothly and predictably. Compared to the gasoline-powered Silverado 2500HD models, the diesel offered significantly more low-end torque, making it ideal for towing heavy loads or navigating challenging terrain. The automatic transmission, while convenient, did result in a slight performance deficit compared to the available manual transmission options, which allowed for more direct control over gear selection. However, the automatic’s ease of use and reduced driver fatigue made it a popular choice for many owners.
Equipment & Trim Levels
The 2011-2014 Silverado 2500HD II in this configuration typically came standard with features like air conditioning, power windows and locks, a basic audio system, and vinyl upholstery. The Regular Cab configuration prioritized functionality over luxury, offering a no-frills interior focused on durability and ease of cleaning. Optional extras included upgraded audio systems, leather upholstery, power-adjustable seats, a navigation system, and various towing packages. The LT trim level, a step up from the base model, added features like chrome exterior trim, upgraded interior materials, and additional convenience features.
Chassis & Braking
The Silverado 2500HD II featured a robust chassis designed to withstand the stresses of heavy-duty use. The front suspension utilized an independent torsion bar setup with double wishbones, providing a comfortable ride and good handling characteristics. The rear suspension employed a traditional leaf spring design, optimized for load-carrying capacity. Braking duties were handled by ventilated disc brakes on all four wheels, providing ample stopping power even when towing heavy loads. An Anti-lock Braking System (ABS) was standard equipment, enhancing safety and control during emergency braking situations.
Market Reception & Comparison
The 2011-2014 Silverado 2500HD with the 6.6L Duramax and Allison automatic received generally positive reviews. Critics praised its powerful engine, smooth transmission, and impressive towing capacity. Fuel economy, while not exceptional, was considered reasonable for a truck of its size and capability. Compared to the gasoline-powered Silverado 2500HD models, the Duramax diesel offered significantly better fuel economy and a much higher towing capacity. However, the diesel engine carried a higher initial cost and potentially higher maintenance expenses. Compared to competitors like the Ford Super Duty and Ram 2500, the Silverado 2500HD was often seen as a well-rounded and capable option, offering a good balance of performance, comfort, and value.
Legacy
The Duramax LML engine and Allison 1000 transmission have proven to be remarkably durable and reliable powertrains. Properly maintained examples of the 2011-2014 Silverado 2500HD continue to command strong resale values in the used car market. While diesel engines generally require more diligent maintenance than their gasoline counterparts, the Duramax LML has earned a reputation for longevity and dependability. These trucks remain popular choices for those needing a capable and reliable work truck, and well-maintained examples are expected to remain on the road for many years to come.
