The Chevrolet Silverado 3500 HD II, specifically the Extended Cab Long Box configuration with the 6.0-liter V8 engine producing 360 horsepower and paired with a four-wheel drive system and automatic transmission, represents a significant iteration in Chevrolet’s heavy-duty truck lineage. Produced from 2007 to 2010 as part of the GMT900 generation, this variant aimed to provide a balance of capability, comfort, and usability for owners needing a robust work truck with passenger space. It occupied a middle ground within the 3500 HD lineup, offering more power and towing capacity than the base models, but remaining more accessible than the diesel-powered options.
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) 4WD SRW 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 | 7.8 kg/Hp, 129 Hp/tonne |
| Weight-to-torque ratio | 5.4 kg/Nm, 184.5 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 | 2791 kg, 6153.1 lbs. |
| Max. weight | 4490 kg, 9898.76 lbs. |
| Max load | 1699 kg, 3745.65 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%) | 5488 kg, 12098.97 lbs. |
| Length | 6330 mm, 249.21 in. |
| Width including mirrors | 2436 mm, 95.91 in. |
| Height | 1927 mm, 75.87 in. |
| Wheelbase | 4001 mm, 157.52 in. |
| Front track | 1742 mm, 68.58 in. |
| Rear (Back) track | 1676 mm, 65.98 in. |
| Ride height (ground clearance) | 233 mm, 9.17 in. |
| Minimum turning circle (turning diameter) | 16 m, 52.49 ft. |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the rear wheels permanently, and the front wheels are driven through an electrically or mechanically operated clutch if necessary. |
| Drive wheel | All wheel drive (4×4) |
| 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 | 265/75 R16; 225/75 R17 |
| Wheel rims size | 7J x 16; 7.5J x 17 |
INTRODUCTION
The Chevrolet Silverado 3500 HD II (GMT900) Extended Cab Long Box 6.0 V8 4WD Automatic, produced between 2007 and 2010, was a key offering in Chevrolet’s heavy-duty truck lineup. The GMT900 platform represented a significant redesign for the Silverado and Sierra HD trucks, focusing on increased capability, improved interior space, and enhanced safety features. This particular configuration, with its extended cab and long bed, catered to buyers who needed both passenger room and substantial cargo capacity. The 6.0-liter Vortec engine and automatic transmission combination provided a balance between power and ease of use, making it a popular choice for both work and personal applications.
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 features a cast iron block and aluminum cylinder heads, contributing to its durability. It utilizes a multi-port fuel injection system for precise fuel delivery and is equipped with an overhead valve (OHV) valvetrain. The engine produces 360 horsepower at 5400 rpm and 515 Nm (379.84 lb-ft) of torque at 4200 rpm. The engine’s relatively high torque output, even at lower RPMs, made it well-suited for 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 Vortec V8 and provide smooth, efficient shifting. The 6-speed configuration allowed for a wider range of gear ratios, optimizing both fuel economy and performance.
Driving Characteristics
The Silverado 3500 HD II 6.0L Automatic offered a driving experience geared towards practicality and capability rather than outright sportiness. The automatic transmission provided smooth and predictable shifts, making it easy to operate in various driving conditions. While not as quick as the manual transmission or diesel-powered variants, the 6.0-liter V8 delivered ample power for everyday driving and towing. The 4WD system provided enhanced traction in challenging conditions, such as snow, mud, or gravel. The long wheelbase and heavy-duty suspension contributed to a comfortable ride, even when the truck was loaded. However, the truck’s size and weight were noticeable, particularly in tight maneuvering situations. The gear ratios in the Hydra-Matic transmission were tuned for towing and hauling, prioritizing low-end torque over rapid acceleration.
Equipment & Trim Levels
The Extended Cab configuration of the Silverado 3500 HD II offered seating for five passengers, with a split-folding bench seat in the rear. Standard features typically included air conditioning, power windows and locks, and an AM/FM stereo. The interior materials were generally durable and practical, reflecting the truck’s work-oriented nature. Optional extras included features like a premium audio system, leather upholstery, power-adjustable seats, and a navigation system. Trim levels varied, but this 6.0L automatic configuration often fell into the mid-range, offering a good balance of features and affordability. The long box provided ample cargo space, making it ideal for hauling large items.
Chassis & Braking
The Silverado 3500 HD II featured a robust chassis designed to withstand heavy loads and demanding conditions. The front suspension utilized an independent torsion bar and double wishbone setup, providing a comfortable ride and good handling. The rear suspension employed a traditional rigid axle with leaf springs, offering excellent load-carrying capacity. Braking duties were handled by ventilated disc brakes on all four wheels, providing ample stopping power. An Anti-lock Braking System (ABS) was standard, enhancing safety and control during emergency braking situations. The truck’s heavy-duty frame and suspension components contributed to its impressive towing and payload capabilities.
Market Reception & Comparison
The Silverado 3500 HD II 6.0L Automatic was generally well-received by critics and consumers alike. It was praised for its powerful engine, smooth transmission, and comfortable ride. Compared to the diesel-powered variants, the 6.0-liter V8 offered a lower initial cost and simpler maintenance. However, it lacked the diesel’s superior fuel economy and ultimate towing capacity. Compared to the smaller 1500 series trucks, the 3500 HD provided significantly more capability and durability. Fuel economy was typical for a heavy-duty truck of its size and class, averaging around 14-16 mpg in mixed driving. Reliability was generally good, with the Vortec V8 engine proving to be a durable and long-lasting powerplant.
Legacy
The Chevrolet Silverado 3500 HD II 6.0L V8 Automatic has proven to be a reliable and capable work truck, maintaining a solid reputation in the used car market. The Vortec LY6 engine is known for its longevity and relatively simple maintenance requirements. While newer heavy-duty trucks offer more advanced technology and features, the GMT900 generation Silverado remains a popular choice for buyers seeking a robust and affordable work truck. Parts availability is generally good, and the truck’s relatively straightforward design makes it easy to repair and maintain. Today, these trucks are often found working on farms, ranches, and construction sites, a testament to their durability and capability.
