The GMC Sierra 2500HD III, specifically the Crew Cab Standard Box configuration powered by the 6.0-liter V8 engine paired with an automatic transmission, represents a significant iteration in GMC’s heavy-duty truck lineage. Produced from 2007 to 2010 as part of the GMT900 generation, this variant aimed to balance robust capability with a degree of everyday usability, targeting buyers needing substantial towing and hauling capacity alongside passenger comfort. It occupied a middle ground within the 2500HD lineup, offering more power and capability than the base models, but remaining more accessible than the diesel-powered options.
Technical Specifications
| Brand | GMC |
| Model | Sierra 2500HD |
| Generation | Sierra 2500HD III (GMT900) Crew Cab Standard Box |
| Type (Engine) | 6.0 V8 (360 Hp) Automatic |
| Start of production | 2007 |
| End of production | 2010 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 5 |
| Doors | 4 |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 7.2 kg/Hp, 138.8 Hp/tonne |
| Weight-to-torque ratio | 5 kg/Nm, 198.5 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 LY6 |
| 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 |
| 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 | 2594 kg, 5718.79 lbs |
| Max. weight | 4173 kg, 9199.89 lbs |
| Max load | 1579 kg, 3481.1 lbs |
| Trunk (boot) space – maximum | 1718 l, 60.67 cu. ft. |
| Permitted trailer load with brakes (12%) | 5670 kg, 12500.21 lbs |
| Length | 6094 mm, 239.92 in |
| Width including mirrors | 2032 mm, 80 in |
| Height | 1958 mm, 77.09 in |
| Wheelbase | 3886 mm, 152.99 in |
| Front track | 1744 mm, 68.66 in |
| Rear (Back) track | 1676 mm, 65.98 in |
| Ride height (ground clearance) | 243 mm, 9.57 in |
| Minimum turning circle (turning diameter) | 15.6 m, 51.18 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, 325×38 mm |
| Rear brakes | Ventilated discs, 325×30 mm |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Cone worm with recirculation balls |
| Tires size | 245/75 R16; 265/75 R17 |
| Wheel rims size | 6.5J x 16; 7.5J x 17 |
INTRODUCTION
The 2007-2010 GMC Sierra 2500HD Crew Cab with the 6.0L V8 and automatic transmission was a key offering in GMC’s strategy to provide a comprehensive range of heavy-duty trucks. Built on the GMT900 platform, which represented a substantial upgrade in terms of interior space, ride quality, and capability compared to its predecessor, this variant aimed to appeal to buyers who needed a powerful truck for work or recreation, but also desired a comfortable and well-equipped cabin for passengers. The Crew Cab configuration, with its four full-size doors, significantly enhanced rear-seat access and comfort, making it a popular choice for families and crews.
Powertrain & Engine Architecture
At the heart of this Sierra 2500HD lies the Vortec LY6 6.0-liter V8 engine. This engine is a member of the Vortec family, known for its robust construction and relatively simple design. The LY6 features a cast iron block and aluminum cylinder heads, contributing to its durability. It utilizes a multi-port fuel injection system, delivering fuel directly to each cylinder for efficient combustion. The overhead valve (OHV) valvetrain, while not as technologically advanced as overhead cam designs, is known for its reliability and ease of maintenance. The engine 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, designed to handle the engine’s substantial torque output and provide smooth shifting. The transmission’s gear ratios are optimized for both towing and everyday driving, offering a balance between power and fuel efficiency.
Driving Characteristics
The 6.0L V8 and automatic transmission combination delivers a driving experience focused on usability and capability. While not as quick as some of the lighter-duty trucks or those equipped with smaller engines, the Sierra 2500HD provides ample power for towing and hauling heavy loads. The automatic transmission shifts smoothly and predictably, making it easy to drive in a variety of conditions. Compared to the manual transmission versions, the automatic offers greater convenience, especially in stop-and-go traffic. However, it does result in a slight reduction in fuel economy and a less direct connection to the engine. The truck’s substantial weight and heavy-duty suspension contribute to a firm ride, but the Crew Cab configuration helps to absorb some of the bumps, providing a more comfortable experience for passengers.
Equipment & Trim Levels
The Sierra 2500HD Crew Cab with the 6.0L V8 typically came standard with a respectable array of features. These included air conditioning, power windows and locks, a CD player, and cloth upholstery. Higher trim levels, such as the SLT, added features like leather upholstery, heated seats, a premium sound system, and automatic climate control. Optional extras included a navigation system, a sunroof, and various towing packages. The interior design was functional and durable, with a focus on providing a comfortable and practical workspace for drivers and passengers.
Chassis & Braking
The GMT900 platform features a fully boxed frame, providing a solid foundation for the truck’s heavy-duty capabilities. The front suspension utilizes an independent torsion bar and double wishbone design, offering a comfortable ride and good handling. The rear suspension employs a traditional leaf spring setup, which is well-suited for carrying heavy loads. 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. The truck’s steering system utilizes a cone worm with recirculation balls, offering a responsive and precise feel.
Market Reception & Comparison
The GMC Sierra 2500HD with the 6.0L V8 and automatic transmission was generally well-received by critics and buyers alike. It was praised for its powerful engine, comfortable ride, and spacious interior. Compared to the diesel-powered versions, the 6.0L V8 offered a lower initial cost and simpler maintenance. However, it lacked the diesel’s superior towing capacity and fuel economy. Compared to the smaller V8 engines offered in the Sierra 2500HD lineup, the 6.0L provided a significant boost in power and torque, making it a more capable choice for demanding tasks. Fuel economy was typical for a heavy-duty truck, averaging around 14-16 mpg in mixed driving.
Legacy
The Vortec LY6 6.0L V8 engine has proven to be a remarkably durable and reliable powertrain. Many examples of the 2007-2010 GMC Sierra 2500HD are still on the road today, testament to its robust construction. While routine maintenance is essential, the engine is generally known for its longevity and relatively low repair costs. In the used car market, these trucks remain popular choices for buyers seeking a capable and affordable heavy-duty truck. The combination of power, comfort, and reliability makes it a compelling option for those needing a truck that can handle both work and family duties.
