The GMC Sierra 2500HD III, specifically the facelifted model produced from 2011 to 2014, represented GMC’s entry into the heavy-duty pickup truck segment. This iteration, built on the GMT900 platform, offered a robust and capable work truck aimed at buyers needing substantial towing and hauling capacity. The Regular Cab Long Box configuration, paired with the 6.0-liter Vortec V8 engine and a four-speed automatic transmission, was a popular choice for those prioritizing functionality and affordability within the Sierra 2500HD lineup. It served as a workhorse for commercial users and individuals requiring a powerful truck for demanding tasks.
Technical Specifications
| Brand | GMC |
| Model | Sierra 2500HD |
| Generation | Sierra 2500HD III (GMT900, facelift 2011) Regular Cab Long Box |
| Type (Engine) | 6.0 V8 (360 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 | Petrol (Gasoline) |
| Weight-to-power ratio | 7.5 kg/Hp, 133.1 Hp/tonne |
| Weight-to-torque ratio | 5.3 kg/Nm, 190.5 Nm/tonne |
| Power | 360 Hp @ 5400 rpm |
| Power per litre | 60.3 Hp/l |
| Torque | 515 Nm @ 4200 rpm, 379.84 lb.-ft. @ 4200 rpm |
| Maximum engine speed | 6000 rpm |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | Vortec L96 |
| 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 |
| Kerb Weight | 2704 kg, 5961.3 lbs. |
| Max. weight | 4309 kg, 9499.72 lbs. |
| Max load | 1605 kg, 3538.42 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 | The Internal combustion engine (ICE) drives the rear wheels permanently, and the front wheels are driven through an electrically or mechanically operated clutch if necessary. |
| Drive wheel | All wheel drive (4×4) |
| 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 |
INTRODUCTION
The 2011-2014 GMC Sierra 2500HD Regular Cab Long Box with the 6.0-liter V8 and automatic transmission was a key offering in GMC’s heavy-duty truck lineup. Positioned as a robust and reliable work truck, it catered to buyers who needed significant payload and towing capabilities without the added cost and complexity of higher trim levels. This model year represented a facelift of the GMT900 platform, bringing updated styling and some refinements to the interior. It was a direct competitor to Ford’s F-250 and Ram’s 2500 series trucks, offering a similar blend of power, durability, and practicality.
Powertrain & Engine Architecture
At the heart of this Sierra 2500HD variant lies the Vortec L96 6.0-liter V8 engine. This engine is a member of GM’s Vortec family, known for its cast iron block and cylinder heads, contributing to its durability. The L96 utilizes a 9.6:1 compression ratio and a multi-port fuel injection system for efficient fuel delivery. The overhead valve (OHV) valvetrain, while not as technologically advanced as overhead cam designs, is known for its simplicity and reliability. The engine produces 360 horsepower at 5400 rpm and 515 lb-ft of torque at 4200 rpm.
The engine is mated to a Hydra-Matic 6L80 six-speed automatic transmission. This transmission was a significant upgrade over the older four-speed automatics, offering smoother shifts, improved fuel economy, and a wider gear ratio spread. The 6L80 is electronically controlled, allowing for adaptive shift patterns based on driving conditions and throttle input. The transmission is designed to handle the high torque output of the 6.0L V8 and provide reliable performance under heavy loads.
Driving Characteristics
The 6.0-liter V8 and six-speed automatic combination in the Sierra 2500HD delivered a capable, if not particularly sporty, driving experience. The engine provided ample low-end torque, making it well-suited for towing and hauling heavy loads. Acceleration was adequate for everyday driving, but the truck’s substantial weight limited its responsiveness. The automatic transmission shifted smoothly and efficiently, and the six gears helped to keep the engine in its optimal power band. Compared to the available Duramax diesel engine, this gasoline V8 offered less torque and lower fuel economy, but it was significantly less expensive to purchase and maintain. Compared to the 6.0L with a manual transmission, the automatic offered greater convenience, especially in stop-and-go traffic, but slightly reduced fuel efficiency and a less direct connection to the engine.
Equipment & Trim Levels
The Regular Cab Long Box 6.0L Automatic Sierra 2500HD typically came with a relatively basic level of equipment, reflecting its positioning as a work-oriented truck. Standard features generally included air conditioning, a basic audio system, vinyl upholstery, and manual windows and locks. Optional extras included power windows and locks, upgraded audio systems, cruise control, and a trailer towing package. The interior was functional and durable, designed to withstand the rigors of daily use. Higher trim levels, such as the SLE and SLT, offered more luxurious features like leather upholstery, heated seats, and advanced infotainment systems, but at a higher price point.
Chassis & Braking
The Sierra 2500HD featured a robust chassis designed to handle heavy loads. The front suspension utilized an independent torsion bar setup with double wishbone components, providing a comfortable ride and good handling. The rear suspension employed a traditional leaf spring design, offering excellent load-carrying capacity. Braking duties were handled by ventilated disc brakes on all four wheels, providing ample stopping power. An Anti-lock Braking System (ABS) was standard, enhancing safety and control during emergency braking situations. The truck’s heavy-duty frame and suspension components contributed to its overall durability and reliability.
Market Reception & Comparison
The 2011-2014 GMC Sierra 2500HD with the 6.0-liter V8 and automatic transmission was generally well-received by critics and buyers alike. It was praised for its robust construction, ample power, and capable towing and hauling abilities. However, its fuel economy was often criticized, particularly compared to diesel-powered alternatives. Compared to the diesel-powered Sierra 2500HD, the 6.0L V8 offered a lower initial cost and simpler maintenance, making it an attractive option for buyers who didn’t require the ultimate in towing capacity or fuel efficiency. The Ford F-250 and Ram 2500 were its primary competitors, offering similar capabilities and features.
Legacy
The Vortec 6.0-liter V8 engine and 6L80 transmission combination proved to be a reliable and durable powertrain. These trucks have maintained a relatively good reputation for longevity, and well-maintained examples continue to be sought after in the used truck market. While not as fuel-efficient as newer trucks, the 2011-2014 Sierra 2500HD remains a capable and affordable option for those needing a heavy-duty pickup. Common maintenance items include regular oil changes, transmission fluid flushes, and inspection of the suspension and braking components. The simplicity of the powertrain makes it relatively easy and inexpensive to repair, contributing to its continued popularity among truck enthusiasts and tradespeople.
