The Chevrolet Silverado 3500 HD II (GMT900) Extended Cab Long Box, equipped with the 6.0-liter V8 engine and automatic transmission, represents a significant iteration in Chevrolet’s heavy-duty truck lineage. Produced from 2007 to 2010, this variant occupied a crucial position in the American truck market, catering to buyers needing substantial towing and hauling capacity without sacrificing everyday usability. It was part of the GMT900 series, a generation known for its enhanced interior space, improved ride quality, and increased capability compared to its predecessors. This particular configuration, featuring a dual rear wheel (DRW) setup, was specifically geared towards demanding commercial and heavy-duty personal use.
Technical Specifications
| Brand | Chevrolet |
| Model | Silverado 3500 HD |
| Generation | Silverado 3500 HD II (GMT900) Extended Cab Long Box |
| Type (Engine) | 6.0 V8 (360 Hp) DRW 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 | 7.9 kg/Hp, 126.5 Hp/tonne |
| Weight-to-torque ratio | 5.5 kg/Nm, 181 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 | 2846 kg, 6274.36 lbs. |
| Max. weight | 5171 kg, 11400.1 lbs. |
| Max load | 2325 kg, 5125.75 lbs. |
| Trunk (boot) space – maximum | 2170 l, 76.63 cu. ft. |
| Fuel tank capacity | 129 l, 34.08 US gal | 28.38 UK gal |
| Permitted trailer load with brakes (12%) | 5443 kg, 11999.76 lbs. |
| Length | 6330 mm, 249.21 in. |
| Width including mirrors | 2436 mm, 95.91 in. |
| Height | 1931 mm, 76.02 in. |
| Wheelbase | 4001 mm, 157.52 in. |
| Front track | 1742 mm, 68.58 in. |
| Rear (Back) track | 1897 mm, 74.69 in. |
| Ride height (ground clearance) | 233 mm, 9.17 in. |
| 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 | 225/75 R17 |
| Wheel rims size | 6.5J x 17 |
INTRODUCTION
The Chevrolet Silverado 3500 HD II, specifically the Extended Cab Long Box configuration with the 6.0L V8 and automatic transmission, was a workhorse designed for the American market. Introduced as part of the GMT900 generation, it aimed to provide a balance between heavy-duty capability and daily drivability. The “HD” designation signifies “Heavy Duty,” indicating its focus on towing, hauling, and overall robustness. The Extended Cab offered additional passenger space compared to the standard cab models, while the Long Box provided a larger cargo bed. The DRW configuration (Dual Rear Wheels) further enhanced its stability and load-carrying capacity, making it a popular choice for commercial applications and owners frequently towing large trailers.
Powertrain & Engine Architecture
At the heart of this Silverado 3500 HD II 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 utilizes a cast iron block and aluminum cylinder heads, contributing to its durability. It features a 9.6:1 compression ratio and utilizes a multi-port fuel injection system for precise fuel delivery. The overhead valve (OHV) valvetrain, while a traditional design, proved to be dependable and relatively easy to maintain. The engine produces 360 horsepower at 5400 rpm and 515 Nm (379.84 lb-ft) of torque at 4200 rpm. This torque output is crucial for heavy towing and hauling. Paired with the engine is the Hydra-Matic 6-speed automatic transmission. This transmission was designed to handle the high torque output of the 6.0L V8 and provide smooth, efficient shifting. The automatic transmission was favored by many buyers for its ease of use, particularly in demanding work conditions.
Driving Characteristics
The Silverado 3500 HD II with the 6.0L V8 and automatic transmission delivers a driving experience focused on capability rather than outright speed. While the 360 horsepower provides adequate power for most tasks, the real strength lies in the engine’s substantial torque. Acceleration is brisk, but the truck’s considerable weight is always apparent. The 6-speed automatic transmission offers a good range of gear ratios, allowing the engine to stay within its optimal power band. Compared to the available Duramax diesel engine option, the 6.0L V8 offers less torque and lower fuel economy, but it is significantly less expensive to purchase and maintain. The DRW configuration provides enhanced stability, especially when towing or carrying heavy loads, but it also results in a wider turning radius. The ride quality, while improved over previous generations, is still firm, reflecting the truck’s heavy-duty nature.
Equipment & Trim Levels
The Silverado 3500 HD II Extended Cab Long Box 6.0L Automatic typically came standard with features like air conditioning, power windows and locks, and a basic audio system. The Extended Cab configuration offered a small rear seat, providing limited passenger space. Higher trim levels, such as the LT and LTZ, added features like leather upholstery, upgraded audio systems, and additional convenience items. Optional extras included a navigation system, sunroof, and various towing packages. The interior design was functional and durable, prioritizing practicality over luxury. The dashboard layout was straightforward and easy to use, with large, clearly marked controls.
Chassis & Braking
The Silverado 3500 HD II features a robust chassis designed to withstand heavy loads. The front suspension utilizes an independent torsion bar and double wishbone setup, providing a comfortable ride and good handling. The rear suspension employs a traditional leaf spring design, known for its durability and load-carrying capacity. The braking system consists of ventilated discs on all four wheels, with larger discs at the front to provide increased stopping power. An Anti-lock Braking System (ABS) was standard, enhancing safety during emergency braking situations. The DRW configuration significantly increases the truck’s stability and braking performance when heavily loaded.
Market Reception & Comparison
The Silverado 3500 HD II with the 6.0L V8 and automatic transmission was generally well-received by critics and buyers alike. It was praised for its strong towing and hauling capabilities, comfortable interior, and improved ride quality compared to previous generations. However, the 6.0L V8 was often criticized for its lower fuel economy compared to the Duramax diesel option. The diesel engine offered significantly more torque and better fuel efficiency, but it came at a higher price. The 6.0L V8 variant appealed to buyers who prioritized affordability and simplicity over maximum towing capacity and fuel economy. It was a popular choice for those who needed a heavy-duty truck for occasional towing and hauling tasks.
Legacy
The Chevrolet Silverado 3500 HD II (GMT900) 6.0L V8 Automatic has proven to be a reliable and durable truck in the used car market. The Vortec LY6 engine is known for its longevity, and the Hydra-Matic transmission is generally dependable when properly maintained. While not as fuel-efficient as the diesel options, the 6.0L V8 remains a viable choice for buyers seeking a capable and affordable heavy-duty truck. These trucks are still commonly seen on roads today, a testament to their robust construction and enduring appeal. Parts availability is generally good, and maintenance costs are relatively reasonable, making them a practical option for those needing a workhorse truck.
