The Chevrolet Silverado 2500HD II, specifically the facelifted version produced from 2011 to 2014, represented a significant evolution of Chevrolet’s heavy-duty truck lineup. This iteration, designated GMT900, continued the Silverado’s tradition of providing robust capability and durability, catering to the demands of owners needing serious towing and hauling capacity. Within the 2500HD range, the Regular Cab Long Box configuration powered by the 6.6-liter Duramax turbodiesel V8 engine paired with an Allison automatic transmission occupied a sweet spot for those prioritizing work capability over luxury or passenger space. This variant was positioned as a workhorse, appealing to commercial users, farmers, and individuals requiring a powerful and reliable truck for demanding tasks.
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) 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 | 7.4 kg/Hp, 135.3 Hp/tonne |
| Weight-to-torque ratio | 2.8 kg/Nm, 353.4 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 | 2934 kg (6468.36 lbs.) |
| Max. weight | 4491 kg (9900.96 lbs.) |
| Max load | 1557 kg (3432.6 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 | Rear wheel drive. Internal Combustion engine. |
| Drive wheel | 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 |
| 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 6.6-liter Duramax LML turbodiesel V8 engine. This engine represents a significant refinement of the Duramax design, incorporating a robust cast iron block, aluminum cylinder heads, and a high-pressure common rail fuel injection system. The LML specifically introduced a cooled exhaust gas recirculation (EGR) system and a diesel particulate filter (DPF) to meet stricter emissions standards. The engine produces 397 horsepower at 3000 rpm and a massive 765 lb-ft (1037 Nm) of torque at just 1600 rpm. This torque output is crucial for heavy towing and hauling. The engine’s OHV valvetrain, while traditional, contributes to its durability and low-end grunt. Paired with the engine is the Allison 1000 six-speed automatic transmission, renowned for its durability and ability to handle high torque loads. The Allison transmission features a lock-up torque converter for improved fuel efficiency at highway speeds and provides smooth, confident shifting even under heavy load.
Driving Characteristics
The 6.6L Duramax with the Allison automatic delivers a driving experience focused on capability rather than outright speed. Acceleration is brisk, but the emphasis is on the immense pulling power available from low engine speeds. The Allison transmission is well-matched to the engine’s characteristics, providing smooth and timely shifts. Compared to gasoline-powered Silverado 2500HD models, this diesel variant offers significantly more torque, making it far more capable when towing heavy trailers or hauling large payloads. While the manual transmission versions of the 2500HD offered a more engaging driving experience for some, the automatic provided ease of use, particularly in stop-and-go traffic or when navigating challenging terrain. The gear ratios in the Allison transmission are optimized for towing, with lower gears providing ample power for climbing hills and accelerating with a load.
Equipment & Trim Levels
The Regular Cab Long Box 6.6L Duramax Automatic Silverado 2500HD typically came with a fairly basic level of equipment, reflecting its work-oriented focus. Standard features generally included air conditioning, a basic audio system, vinyl upholstery, and manual windows and locks. However, options were available to upgrade the interior, including cloth or leather upholstery, power windows and locks, a premium audio system, and a navigation system. The exterior typically featured black plastic bumpers and grille surrounds, although chrome options were available. This trim level was often chosen by fleet buyers and individuals who prioritized functionality and durability over luxury features.
Chassis & Braking
The Silverado 2500HD II utilizes a body-on-frame construction, providing a robust and durable platform for heavy-duty use. The front suspension features an independent torsion bar setup with double wishbones, while the rear suspension employs a traditional leaf spring design. This configuration provides a comfortable ride, even when the truck is loaded. Braking duties are handled by ventilated disc brakes on all four wheels, with ABS as standard equipment. The rear brakes are slightly larger than the front brakes to accommodate the increased weight and stopping demands. The steering system utilizes a cone worm with recirculation balls, providing a solid and predictable steering feel.
Market Reception & Comparison
The 2011-2014 Silverado 2500HD with the 6.6L Duramax and Allison automatic was generally well-received by critics and consumers alike. It was praised for its immense towing and hauling capacity, its durable powertrain, and its comfortable ride. Compared to the gasoline-powered Silverado 2500HD models, the Duramax diesel offered significantly better fuel economy when towing heavy loads. However, the diesel engine came with a higher initial cost and potentially higher maintenance costs due to the complexity of the emissions control systems. Compared to competitors like the Ford Super Duty and Ram 2500, the Silverado 2500HD offered a competitive combination of capability, reliability, and value.
Legacy
The Duramax LML engine and Allison transmission combination has proven to be exceptionally durable and reliable. Well-maintained examples of these trucks continue to command strong resale values in the used car market. The LML Duramax is known for its longevity and ability to withstand high mileage. However, potential buyers should be aware of the maintenance requirements of the diesel emissions system, including the DPF and EGR systems. Regular maintenance and proper operation are crucial to ensure the long-term reliability of these components. The Silverado 2500HD II with the 6.6L Duramax remains a popular choice for those needing a capable and dependable heavy-duty truck.
