The GMC Sierra 2500HD III, specifically the Crew Cab Long Box configuration with the 6.0-liter V8 engine and automatic transmission, represents a significant iteration in GMC’s heavy-duty truck lineage. Produced from 2011 to 2014 as part of the GMT900 platform’s facelift, this variant aimed to balance robust capability with a degree of everyday usability. It occupied a sweet spot in the Sierra 2500HD lineup, offering a substantial increase in towing and payload capacity over the 1500 series, while remaining more accessible than the diesel-powered 2500HD and 3500HD models. This truck was primarily marketed towards American consumers needing a powerful workhorse for both commercial and personal applications, such as hauling equipment, boats, or recreational vehicles.
Technical Specifications
| Brand | GMC |
| Model | Sierra 2500HD |
| Generation | Sierra 2500HD III (GMT900, facelift 2011) Crew Cab Long Box |
| Type (Engine) | 6.0 V8 (360 Hp) Automatic |
| Start of production | 2011 |
| End of production | 2014 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 5 |
| Doors | 4 |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 7.9 kg/Hp, 126.9 Hp/tonne |
| Weight-to-torque ratio | 5.5 kg/Nm, 181.6 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 | 2836 kg, 6252.31 lbs. |
| Max. weight | 4309 kg, 9499.72 lbs. |
| Max load | 1473 kg, 3247.41 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 | 2032 mm, 80 in. |
| Height | 1984 mm, 78.11 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) | 211 mm, 8.31 in. |
| Minimum turning circle (turning diameter) | 16.7 m, 54.79 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
At the heart of this Sierra 2500HD variant lies the Vortec L96 6.0-liter V8 engine. This engine, a member of GM’s Vortec family, is a cast-iron block, aluminum-head design known for its durability and relatively simple architecture. It utilizes a traditional overhead valve (OHV) valvetrain with variable valve timing (VVT) to optimize performance and efficiency. Fuel delivery is managed by a multi-port fuel injection system, providing precise fuel metering for consistent combustion. The L96 produces 360 horsepower at 5400 rpm and 515 lb-ft of torque at 4200 rpm. This power is channeled through a six-speed Hydra-Matic automatic transmission, specifically designed to handle the high torque output of the V8. The transmission features electronically controlled shifting for smooth and responsive gear changes.
Driving Characteristics
The 6.0-liter V8 and six-speed automatic combination delivers a noticeable balance of power and usability. While not as quick as some of the lighter-duty trucks, the Sierra 2500HD provides ample torque for towing and hauling heavy loads. The automatic transmission is well-tuned, offering smooth shifts and a wide gear ratio spread to keep the engine in its optimal power band. Compared to the manual transmission options, the automatic prioritizes convenience and ease of use, making it ideal for drivers who frequently operate in stop-and-go traffic or tow regularly. The gear ratios are optimized for low-end grunt, allowing for confident acceleration even with a substantial load. However, the automatic does slightly diminish fuel economy compared to the manual transmission.
Equipment & Trim Levels
The Crew Cab Long Box 6.0L Automatic Sierra 2500HD typically came standard with features like air conditioning, power windows and locks, a basic audio system, and cloth upholstery. Higher trim levels, such as the SLT and Denali, added features like leather upholstery, heated seats, a premium audio system, navigation, and a host of convenience features. 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 work crews. The Long Box bed offered a generous amount of cargo space, further enhancing the truck’s versatility.
Chassis & Braking
The Sierra 2500HD utilizes a robust chassis designed to withstand heavy loads and demanding conditions. The front suspension features an independent torsion bar setup with double wishbones, providing a comfortable ride and good handling. The rear suspension employs a traditional leaf spring design, offering excellent load-carrying capacity. Braking duties are handled by ventilated disc brakes on all four wheels, providing ample stopping power. An Anti-lock Braking System (ABS) is standard, enhancing safety and control during emergency braking situations. The truck’s steering system utilizes a cone worm with recirculation balls, offering a solid and predictable feel.
Market Reception & Comparison
The 6.0-liter V8-powered Sierra 2500HD received generally positive reviews. Critics praised its strong towing capacity, comfortable ride, and user-friendly automatic transmission. Compared to the Duramax diesel engine option, the 6.0L V8 offered a lower initial cost but sacrificed some fuel economy and ultimate towing capacity. The V8 was also considered easier and less expensive to maintain than the diesel. Against competitors like the Ford Super Duty and Ram 2500, the Sierra 2500HD held its own, offering a compelling combination of capability, comfort, and value.
Legacy
The Vortec L96 6.0-liter V8 has proven to be a relatively reliable engine, with many examples still in service today. While not immune to issues like oil consumption and occasional Active Fuel Management (AFM) problems, the engine is generally considered durable and relatively easy to repair. The six-speed Hydra-Matic automatic transmission is also known for its robustness. In the used car market, these Sierra 2500HDs remain popular choices for those seeking a capable and affordable heavy-duty truck. Their combination of power, space, and reliability makes them well-suited for a variety of tasks, from work to recreation.
