The Chevrolet Silverado 2500 HD II, specifically the Crew Cab Standard Box configuration powered by the 6.6-liter Duramax Turbo Diesel V8 engine producing 365 horsepower, represents a significant iteration in Chevrolet’s heavy-duty truck lineage. Produced from 2007 to 2010 (GMT900 platform), this variant occupied a premium position within the Silverado 2500 HD lineup, targeting buyers needing substantial towing and hauling capacity combined with a degree of interior comfort. It was a key player in the competitive American heavy-duty truck market, directly challenging offerings from Ford and Dodge (Ram).
Technical Specifications
| Brand | Chevrolet |
| Model | Silverado 2500 HD |
| Generation | Silverado 2500 HD II (GMT900) Crew Cab Standard Box |
| Type (Engine) | 6.6 Duramax TD V8 (365 Hp) 4WD Automatic |
| Start of production | 2007 |
| End of production | 2010 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 5 |
| Doors | 4 |
| Fuel Type | Diesel |
| Weight-to-power ratio | 8.3 kg/Hp, 120.7 Hp/tonne |
| Weight-to-torque ratio | 3.4 kg/Nm, 295.9 Nm/tonne |
| Power | 365 Hp @ 3200 rpm |
| Power per litre | 55.3 Hp/l |
| Torque | 895 Nm @ 1600 rpm (660.12 lb.-ft. @ 1600 rpm) |
| Maximum engine speed | 3450 rpm |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | Duramax LMM |
| Engine displacement | 6599 cm3 (402.7 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 103 mm (4.06 in.) |
| Piston Stroke | 99 mm (3.9 in.) |
| Compression ratio | 16.8:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Valvetrain | OHV |
| Engine oil capacity | 9.5 l (10.04 US qt | 8.36 UK qt) |
| Coolant | 24 l (25.36 US qt | 21.12 UK qt) |
| Kerb Weight | 3025 kg (6668.98 lbs.) |
| Max. weight | 4173 kg (9199.89 lbs.) |
| Max load | 1148 kg (2530.91 lbs.) |
| Trunk (boot) space – maximum | 1718 l (60.67 cu. ft.) |
| Permitted trailer load with brakes (12%) | 5897 kg (13000.66 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 | All wheel drive (4×4). ICE drives rear wheels, front wheels engaged via clutch. |
| Number of gears and type of gearbox | 6 gears, automatic transmission Allison |
| 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 Chevrolet Silverado 2500 HD II, in its Crew Cab Standard Box configuration with the 6.6L Duramax diesel and Allison automatic transmission, was a workhorse designed for demanding tasks. Built on the GMT900 platform, this generation represented a significant upgrade in terms of capability and refinement over its predecessor. The Crew Cab body style offered increased passenger space, making it suitable for both work and family use. This particular variant was positioned as a premium offering, bridging the gap between the base work trucks and the fully-loaded luxury trims.
Powertrain & Engine Architecture
At the heart of this Silverado 2500 HD lies the Duramax LMM 6.6-liter turbocharged diesel V8 engine. This engine is a testament to diesel engineering, featuring a cast iron block, aluminum cylinder heads, and a robust crankshaft. The LMM engine built upon the foundation of the earlier LBZ Duramax, incorporating improvements to the fuel injection system and turbocharger for increased efficiency and power. It utilizes a common-rail direct injection system, delivering fuel at extremely high pressures for optimal combustion. The engine also features a variable geometry turbocharger (VGT) which optimizes boost across the engine’s RPM range. The valvetrain employs an overhead valve (OHV) configuration, known for its simplicity and durability. The Allison 1000 series 6-speed automatic transmission is a critical component, specifically designed to handle the immense torque output of the Duramax engine. This transmission is renowned for its durability and smooth shifting characteristics, featuring a lock-up torque converter for improved fuel efficiency at highway speeds.
Driving Characteristics
The Silverado 2500 HD 6.6L Duramax with the Allison automatic delivers a driving experience focused on capability rather than outright speed. While 365 horsepower is respectable, the true strength lies in the 895 lb-ft of torque available at a relatively low 1600 rpm. This translates to effortless towing and hauling, even with substantial loads. The Allison transmission is well-matched to the engine, providing smooth and predictable shifts. Compared to the gasoline-powered Silverado 2500 HD models, the Duramax diesel offers significantly more low-end grunt and superior towing capacity. However, it lacks the responsiveness of the gasoline engines. Compared to manual transmission equipped Duramax models, the automatic offers convenience but may result in a slight reduction in fuel economy and a less direct connection to the powertrain.
Equipment & Trim Levels
The Crew Cab Standard Box configuration typically included features such as air conditioning, power windows and locks, a CD player, and cloth upholstery. Higher trim levels, such as the LT and LTZ, added features like leather upholstery, heated seats, a premium sound system, and navigation. Optional extras included a sunroof, remote start, and various towing packages. The standard box length provided a good balance between cargo capacity and vehicle maneuverability.
Chassis & Braking
The Silverado 2500 HD features a fully boxed frame for enhanced rigidity and durability. The front suspension utilizes an independent torsion bar setup with double wishbone components, providing a comfortable ride while maintaining good handling characteristics. The rear suspension employs a traditional leaf spring design, optimized for heavy-duty load carrying. 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 robust chassis and braking system are designed to safely handle the truck’s substantial weight and towing capacity.
Market Reception & Comparison
The Silverado 2500 HD with the Duramax diesel engine was generally well-received by critics and consumers alike. It was praised for its powerful engine, durable transmission, and impressive towing capacity. Fuel economy, while not exceptional, was considered reasonable for a heavy-duty truck. Compared to the gasoline-powered Silverado 2500 HD models, the Duramax diesel commanded a higher price but offered significantly lower operating costs for high-mileage users. Reliability was generally good, although some owners reported issues with the fuel injection system and turbocharger. Compared to the Ford Super Duty and Dodge Ram 2500/3500, the Silverado 2500 HD was often seen as a strong contender, offering a compelling combination of capability, comfort, and value.
Legacy
The Duramax LMM engine and Allison transmission combination has proven to be remarkably durable, with many examples exceeding 200,000 miles with proper maintenance. On the used car market, these Silverado 2500 HDs remain popular choices for buyers seeking a capable and reliable heavy-duty truck. However, potential buyers should be aware of potential maintenance costs associated with the diesel engine and its emissions control systems. The GMT900 platform Silverado 2500 HD established a strong reputation for durability and capability, solidifying Chevrolet’s position as a leader in the heavy-duty truck segment.
