The Chevrolet Silverado 2500 HD II, specifically the Extended Cab Long Box configuration equipped with the 6.0L V8 engine and an automatic transmission, and capable of running on Compressed Natural Gas (CNG), was a heavy-duty pickup truck manufactured by Chevrolet for the 2013 and 2014 model years. This variant occupied a mid-range position within the GMT900 platform, slotting between the basic work truck models and the more upscale LTZ trims. It was designed for buyers who required significant towing and hauling capabilities, with the added advantage of alternative fuel operation through its CNG conversion. The GMT900 series underwent a facelift in 2011, bringing updated styling and interior enhancements to the Silverado HD lineup.
Technical Specifications
| Brand | Chevrolet |
| Model | Silverado 2500 HD |
| Generation | Silverado 2500 HD II (GMT900, facelift 2011) Extended Cab Long Box |
| Type (Engine) | 6.0 V8 (301 Hp) Automatic CNG |
| Start of production | 2013 |
| End of production | 2014 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 5 |
| Doors | 2 |
| Fuel Type | Petrol / CNG |
| Power | 301 Hp @ 5000 rpm |
| Power per litre | 50.4 Hp/l |
| Torque | 452 Nm @ 4200 rpm / 333.38 lb.-ft. @ 4200 rpm |
| Maximum engine speed | 6000 rpm |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | Vortec LC8 |
| Engine displacement | 5967 cm3 / 364.13 cu. in. |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 101.6 mm / 4 in. |
| Piston Stroke | 92 mm / 3.62 in. |
| Compression ratio | 9.6:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | OHV, VVT |
| Engine oil capacity | 5.7 l / 6.02 US qt | 5.02 UK qt |
| Coolant | 15.5 l / 16.38 US qt | 13.64 UK qt |
| Fuel tank capacity | 136 l / 35.93 US gal | 29.92 UK gal |
| CNG cylinder capacity | 67 kg |
| Length | 6337 mm / 249.49 in. |
| Width including mirrors | 2032 mm / 80 in. |
| Height | 1971 mm / 77.6 in. |
| Wheelbase | 4018 mm / 158.19 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) | 15.8 m / 51.84 ft. |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the rear wheels of the vehicle. |
| Drive wheel | Rear wheel drive |
| Number of gears and type of gearbox | 6 gears, automatic transmission Hydra-Matic |
| 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 Silverado 2500 HD’s powertrain centers around the Vortec LC8 6.0-liter V8 engine. This engine is part of Chevrolet’s Vortec series, recognized for its robust construction and relatively straightforward design. It features a cast iron block and aluminum cylinder heads. The LC8 employs a multi-port fuel injection system, delivering fuel directly to each cylinder. The engine utilizes an overhead valve (OHV) valvetrain, incorporating variable valve timing (VVT) on the intake side to enhance low-end torque and improve fuel efficiency. The CNG conversion allows the engine to operate on gasoline, compressed natural gas, or a combination of both, potentially reducing fuel costs and emissions. The standard transmission was the Hydra-Matic 6L80E six-speed automatic, offering smooth shifting and optimized gear ratios for towing and hauling. This transmission is electronically controlled, adapting to driving conditions and driver input.
Driving Characteristics
The combination of the 6.0L V8 and the 6L80E automatic transmission provided a balance of power and usability. While not as quick as the diesel-powered Silverado HD models, the 301 horsepower and 452 Nm (333 lb-ft) of torque delivered sufficient capability for everyday tasks and substantial towing. The automatic transmission’s gear ratios were optimized for hauling, prioritizing low-end power over rapid acceleration. Compared to the manual transmission options, the automatic offered greater convenience, particularly in stop-and-go traffic, though it resulted in a slight decrease in fuel economy. Utilizing the CNG capability altered the driving experience, often resulting in a minor power reduction but potentially lower fuel costs. The ride quality, typical of heavy-duty trucks, was firm but acceptable, and the steering provided a confident feel, though with some play.
Equipment & Trim Levels
The Extended Cab Long Box 6.0L CNG Silverado 2500 HD typically came standard with features like air conditioning, power windows and locks, a basic audio system, and vinyl upholstery. The Extended Cab configuration offered additional rear seating, although legroom was limited. Optional extras included upgraded audio systems, a navigation system, leather upholstery, power-adjustable seats, and various towing packages. The CNG conversion added a dedicated fuel tank and the necessary fuel system components. The exterior styling aligned with the GMT900 facelift, featuring a bolder grille and updated headlights.
Chassis & Braking
The Silverado 2500 HD employed a body-on-frame construction, providing a strong platform for heavy-duty applications. The front suspension utilized an independent torsion bar setup with double wishbones, while the rear suspension featured a traditional leaf spring design. This configuration prioritized load-carrying capacity and durability. Braking was provided by ventilated disc brakes on all four wheels, offering adequate stopping power for the truck’s weight. An Anti-lock Braking System (ABS) was standard. The rear axle ratio varied depending on the specific configuration, influencing both towing capacity and fuel economy.
Market Reception & Comparison
The 6.0L V8/automatic CNG Silverado 2500 HD received mixed reviews. Critics acknowledged its capability and the benefit of the CNG option, especially in areas with accessible CNG fueling infrastructure. However, some found the gasoline engine’s performance to be less impressive compared to the available Duramax diesel engines. Fuel economy, even with CNG, was not a strong point, consistent with heavy-duty trucks. Compared to the diesel variants, the 6.0L offered a lower initial purchase price but potentially higher long-term operating costs, particularly considering fuel consumption. The CNG conversion increased the initial cost but offered potential fuel savings for those who could benefit from lower CNG prices.
Legacy
The Silverado 2500 HD II (GMT900) with the 6.0L V8 and automatic transmission has gained a reputation for reliability, although maintenance costs can be higher than some competitors. The Vortec LC8 engine is generally considered durable, but consistent maintenance is essential. The CNG conversion, while offering potential advantages, requires specialized servicing. In the used car market, these trucks remain popular among those needing a capable work vehicle. Their value is influenced by mileage, condition, and the functionality of the CNG system. While not as highly sought-after as the diesel models, the 6.0L variants provide a more affordable entry point into the heavy-duty truck segment.
