The Chevrolet Silverado 2500 HD II, specifically the Extended Cab Standard Box configuration with the 6.0-liter V8 engine and automatic transmission, was a mainstay of Chevrolet’s heavy-duty truck lineup from 2007 to 2010. Representing the second generation of the GMT900 series, this variant occupied a sweet spot for buyers needing substantial towing and hauling capacity without opting for the more expensive and feature-laden trims. It served as a workhorse for contractors, farmers, and individuals requiring a robust pickup for demanding tasks, and was a common sight on American roads during its production run.
Technical Specifications
| Brand | Chevrolet |
| Model | Silverado 2500 HD |
| Generation | Silverado 2500 HD II (GMT900) Extended 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 | 2 |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 7 kg/Hp, 142.3 Hp/tonne |
| Weight-to-torque ratio | 4.9 kg/Nm, 203.6 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 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 | 2529 kg, 5575.49 lbs. |
| Max. weight | 4173 kg, 9199.89 lbs. |
| Max load | 1644 kg, 3624.4 lbs. |
| Trunk (boot) space – maximum | 1718 l, 60.67 cu. ft. |
| Fuel tank capacity | 98 l, 25.89 US gal | 21.56 UK gal |
| Permitted trailer load with brakes (12%) | 5761 kg, 12700.83 lbs. |
| Length | 5850 mm, 230.31 in. |
| Width including mirrors | 2032 mm, 80 in. |
| Height | 1951 mm, 76.81 in. |
| Wheelbase | 3645 mm, 143.5 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) | 14.5 m, 47.57 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 Chevrolet Silverado 2500 HD II (GMT900) Extended Cab Standard Box, powered by the 6.0-liter Vortec LY6 V8 and paired with a 6-speed Hydra-Matic automatic transmission, represented a significant offering in the American heavy-duty truck market between 2007 and 2010. This configuration was positioned as a versatile option, bridging the gap between the base work trucks and the more luxurious, higher-trim level Silverados. The GMT900 platform, introduced in 2007, brought a substantial redesign to the Silverado HD line, focusing on increased capability, improved interior space, and enhanced safety features. The Extended Cab provided additional passenger space compared to the regular cab models, while the Standard Box offered a practical bed length for a variety of hauling needs.
Powertrain & Engine Architecture
At the heart of this Silverado variant lies the Vortec LY6 6.0-liter V8 engine. This engine is a member of Chevrolet’s Vortec family, known for its robust construction and reliable performance. 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 a traditional design, proved to be dependable and relatively simple to maintain. The 6-speed Hydra-Matic 4L80-E automatic transmission was specifically chosen for its ability to handle the engine’s substantial torque output and provide smooth, reliable shifting. This transmission featured electronically controlled shifting and overdrive for improved fuel economy at highway speeds. The transmission was known for its durability, but also for its weight, contributing to the overall heft of the truck.
Driving Characteristics
The 6.0-liter V8, producing 360 horsepower and 380 lb-ft of torque, provided ample power for towing and hauling, but wasn’t designed for outright speed. Acceleration was adequate, but the truck’s considerable weight (over 5,500 lbs) meant it wasn’t particularly nimble. The automatic transmission’s gear ratios were optimized for towing, with lower gears providing strong pulling power and higher gears offering reasonable fuel economy during highway cruising. Compared to the available 8.1-liter V8, the 6.0-liter offered a better balance of power and fuel efficiency. Against the Duramax diesel options, the 6.0L lacked the sheer torque for extremely heavy loads, but it was significantly less expensive to purchase and maintain. The ride quality, typical of heavy-duty trucks, was firm, even when unloaded, due to the robust suspension components.
Equipment & Trim Levels
The Silverado 2500 HD II in this configuration typically came standard with features like air conditioning, power windows and locks, and a basic audio system. The Extended Cab offered a split bench seat in the rear, providing seating for three passengers, although legroom was somewhat limited. The interior materials were generally durable and functional, rather than luxurious. Optional extras included upgraded audio systems, power-adjustable seats, a towing package (including trailer brake controller), and various appearance enhancements. The LT trim level was a popular upgrade, adding features like chrome exterior trim, upgraded interior materials, and additional convenience items.
Chassis & Braking
The Silverado 2500 HD II utilized a body-on-frame construction, providing a solid and durable platform for heavy-duty use. The front suspension featured an independent torsion bar setup with double wishbone control arms, while the rear suspension employed a traditional leaf spring design. This combination provided a good balance of ride comfort and load-carrying capacity. Braking duties were handled by ventilated disc brakes on all four wheels, with ABS (Anti-lock Braking System) as standard equipment. The rear brakes were slightly smaller in diameter than the front brakes. The steering system was a recirculating ball type, providing a robust and reliable steering feel, though it lacked the precision of more modern steering systems.
Market Reception & Comparison
The Silverado 2500 HD II with the 6.0-liter V8 and automatic transmission was generally well-received by critics and consumers alike. It was praised for its strong towing capacity, reliable powertrain, and relatively affordable price point. Fuel economy, however, was a common criticism, as expected for a heavy-duty truck. Compared to the diesel-powered Silverado 2500 HD models, the 6.0-liter V8 offered lower initial cost and simpler maintenance, but sacrificed fuel efficiency and ultimate towing capacity. Against competitors like the Ford Super Duty and Ram Heavy Duty trucks, the Silverado 2500 HD II held its own, offering a competitive combination of features, performance, and value.
Legacy
The Vortec LY6 6.0-liter V8 and 4L80-E automatic transmission combination proved to be a durable and reliable powertrain. These trucks are still commonly found on the used car market today, often with high mileage but still capable of performing demanding tasks. While not as sought-after as the diesel variants, the 6.0-liter Silverado 2500 HD II remains a popular choice for those seeking a capable and affordable heavy-duty truck. Maintenance is generally straightforward, and parts availability is good. However, potential buyers should be aware of potential issues such as oil leaks and Active Fuel Management (AFM) system failures, which can occur with higher mileage engines.
