The GMC Sierra 2500HD III, specifically the Regular 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 was aimed squarely at buyers needing substantial towing and hauling capability without the added complexity or cost of higher trim levels. It occupied a crucial position in the Sierra 2500HD lineup, serving as a workhorse option for commercial users, farmers, and individuals requiring a robust pickup for demanding tasks. This model year saw updates to the interior and exterior styling, along with refinements to the powertrain for improved efficiency and durability.
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) 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 | 7.3 kg/Hp, 136.7 Hp/tonne |
| Weight-to-torque ratio | 5.1 kg/Nm, 195.5 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 | 2634 kg, 5806.98 lbs. |
| Max. weight | 4536 kg, 10000.17 lbs. |
| Max load | 1902 kg, 4193.19 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 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 staple of GM’s heavy-duty truck lineup for many years, is a cast-iron block, overhead valve (OHV) design. It utilizes a 9.6:1 compression ratio and multi-port fuel injection to deliver a respectable 360 horsepower at 5400 rpm and 515 Nm (379.84 lb-ft) of torque at 4200 rpm. The L96 features variable valve timing (VVT) on the intake valves, enhancing low-end torque and improving fuel efficiency. The engine’s robust construction and relatively simple design contribute to its reputation for reliability. Paired with the engine is the Hydra-Matic 6L80E six-speed automatic transmission. This transmission is known for its durability and smooth shifting characteristics, providing adequate gear ratios for both towing and everyday driving. The transmission was specifically tuned for the heavy-duty application, prioritizing strength and dependability over outright performance.
Driving Characteristics
The 6.0L V8 and 6L80E automatic combination in the Sierra 2500HD delivers a driving experience focused on capability rather than sportiness. Acceleration is adequate for a vehicle of this size and weight, but it’s not particularly quick. The emphasis is on providing ample low-end torque for towing and hauling heavy loads. The automatic transmission shifts smoothly and predictably, although it can sometimes feel hesitant when downshifting for passing maneuvers. Compared to the available Duramax diesel engine, this gasoline V8 offers significantly less torque, making it less ideal for extremely heavy towing. However, it provides a quieter and smoother driving experience than the diesel, and the initial purchase price is considerably lower. The long wheelbase and robust suspension contribute to a comfortable ride, even when unladen, but the truck’s size can make it challenging to maneuver in tight spaces.
Equipment & Trim Levels
The Regular Cab Long Box 6.0L Automatic Sierra 2500HD typically represented the base work truck configuration. Standard features included a basic audio system, vinyl upholstery, air conditioning, and power windows and locks. The interior was functional and durable, designed to withstand the rigors of daily use. Optional extras included upgraded audio systems, power seats, cruise control, and a trailer towing package. The exterior typically featured black plastic bumpers and side moldings, with limited chrome accents. This trim level was often chosen by commercial buyers who prioritized functionality and affordability over luxury features.
Chassis & Braking
The Sierra 2500HD’s chassis is built around a fully boxed frame, providing a solid foundation for heavy-duty use. The front suspension utilizes an independent torsion bar setup with double wishbone control arms, while the rear suspension employs a traditional leaf spring design. This combination provides a good balance of ride comfort and load-carrying capacity. Braking duties are handled by ventilated disc brakes on all four wheels, with ABS (Anti-lock Braking System) as standard equipment. The rear brakes are slightly smaller in diameter than the front brakes. The steering system is a cone worm with recirculation balls, providing a direct and responsive feel.
Market Reception & Comparison
The 2011-2014 GMC Sierra 2500HD with the 6.0L V8 and automatic transmission received generally positive reviews for its capability and reliability. Critics praised the engine’s ample power and torque, as well as the transmission’s smooth shifting characteristics. However, some reviewers noted that the fuel economy was relatively poor compared to diesel-powered alternatives. Compared to the 6.6L Duramax diesel engine, the 6.0L V8 offered significantly lower towing capacity and fuel efficiency, but it was also less expensive to purchase and maintain. The 6.0L engine was often favored by buyers who did not require the extreme towing capabilities of the diesel engine and preferred the quieter operation and lower maintenance costs of a gasoline engine.
Legacy
The GMC Sierra 2500HD III with the 6.0L V8 and automatic transmission has proven to be a durable and reliable work truck. The Vortec L96 engine is known for its longevity, and the 6L80E transmission is also generally considered to be a robust unit. In the used car market, these trucks remain popular among buyers seeking a capable and affordable heavy-duty pickup. While fuel economy is a concern, the relatively low purchase price and readily available parts make them an attractive option for those needing a dependable truck for work or recreational purposes. Regular maintenance, including oil changes and transmission fluid flushes, is crucial for ensuring the long-term reliability of this powertrain.
