The GMC Sierra 3500HD III, specifically the Crew Cab Long Box configuration with the 6.0-liter V8 engine and four-wheel drive, represents a significant iteration in GMC’s heavy-duty truck lineage. Produced from 2011 to 2013 as part of the GMT900 platform’s facelift, this variant aimed to balance robust capability with a degree of comfort and refinement for the American truck buyer. It occupied a sweet spot in the Sierra 3500HD lineup, offering a substantial increase in towing and payload capacity over the 2500HD series, while remaining more accessible than the diesel-powered options within the 3500HD range. This model was a key player in GMC’s strategy to compete directly with Ford’s Super Duty and Ram’s heavy-duty offerings in the North American market.
Technical Specifications
| Brand | GMC |
| Model | Sierra 3500HD |
| Generation | Sierra 3500HD III (GMT900, facelift 2011) Crew Cab Long Box |
| Type (Engine) | 6.0 V8 (360 Hp) 4WD SRW Automatic |
| Start of production | 2011 |
| End of production | 2013 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 5 |
| Doors | 4 |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 8.5 kg/Hp, 117.9 Hp/tonne |
| Weight-to-torque ratio | 5.9 kg/Nm, 168.6 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 L96 |
| 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, VVT |
| 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 | 3054 kg, 6732.92 lbs. |
| Max. weight | 4990 kg, 11001.07 lbs. |
| Max load | 1936 kg, 4268.15 lbs. |
| Trunk (boot) space – maximum | 2138 l, 75.5 cu. ft. |
| Fuel tank capacity | 136 l, 35.93 US gal | 29.92 UK gal |
| Permitted trailer load with brakes (12%) | 5897 kg, 13000.66 lbs. |
| Length | 6581 mm, 259.09 in. |
| Width including mirrors | 2436 mm, 95.91 in. |
| Height | 1979 mm, 77.91 in. |
| Wheelbase | 4260 mm, 167.72 in. |
| Front track | 1748 mm, 68.82 in. |
| Rear (Back) track | 1709 mm, 67.28 in. |
| Ride height (ground clearance) | 213 mm, 8.39 in. |
| Minimum turning circle (turning diameter) | 16.7 m, 54.79 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, 355×40 mm |
| Rear brakes | Ventilated discs, 373×34 mm |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Cone worm with recirculation balls |
| Tires size | 235/80 R17; 265/70 R18 |
Powertrain & Engine Architecture
At the heart of this Sierra 3500HD variant lies the Vortec L96 6.0-liter V8 engine. This engine, a staple of GM’s truck and SUV lineup for many years, is a cast-iron block, overhead valve (OHV) design. It utilizes a multi-port fuel injection system, delivering fuel directly into the intake ports. The L96 features variable valve timing (VVT) on the intake camshaft, enhancing low-end torque and improving fuel efficiency. The engine produces 360 horsepower at 5400 rpm and 515 Nm (379.84 lb-ft) of torque at 4200 rpm. This power is channeled through a six-speed Hydra-Matic automatic transmission, known for its durability and smooth shifting. The transmission was specifically tuned for heavy-duty applications, with reinforced components to handle the substantial torque output of the L96 engine.
Driving Characteristics
The 6.0L V8 and automatic transmission combination provided a comfortable and capable driving experience, though it wasn’t the most performance-oriented setup. Acceleration was adequate for everyday driving and towing, but noticeably slower than the available Duramax diesel options. The automatic transmission’s gear ratios were optimized for towing and hauling, prioritizing low-end grunt over outright speed. While the diesel engines offered superior torque and fuel economy, the gasoline V8 provided a more familiar and quieter driving experience for those less concerned with maximizing fuel savings. The 4WD system offered confident traction in various conditions, making it suitable for both on-road and off-road use.
Equipment & Trim Levels
The Crew Cab Long Box 3500HD typically came standard with features like air conditioning, power windows and locks, a basic audio system, and cloth upholstery. The specific trim level (e.g., WT, SLE, SLT) dictated the level of standard equipment. Higher trims offered features such as leather upholstery, heated seats, a premium audio system, navigation, and a rear-seat entertainment system. Optional extras included a trailer brake controller, upgraded suspension packages, and various appearance packages. The Crew Cab configuration provided ample space for passengers, making it a popular choice for families and those who frequently transport multiple occupants.
Chassis & Braking
The Sierra 3500HD featured a robust chassis designed to withstand heavy loads. The front suspension utilized an independent torsion bar setup with double wishbones, while the rear suspension employed a traditional leaf spring configuration. This setup provided a comfortable ride while maintaining excellent load-carrying capacity. Braking duties were handled by ventilated disc brakes on all four wheels, providing ample stopping power even when towing. An Anti-lock Braking System (ABS) was standard, enhancing safety and control during emergency braking situations.
Market Reception & Comparison
Critics generally praised the GMC Sierra 3500HD for its robust construction, comfortable interior, and capable towing performance. However, the 6.0L V8/automatic combination was often seen as a compromise compared to the more powerful and fuel-efficient Duramax diesel engine. Fuel economy was a common criticism, as the gasoline V8 consumed significantly more fuel than the diesel alternative. Compared to the 2500HD, the 3500HD offered a substantial increase in towing and payload capacity, making it ideal for those with demanding hauling needs.
Legacy
The GMT900-based Sierra 3500HD, including the 6.0L V8 variant, has proven to be a relatively reliable truck in the used car market. The Vortec L96 engine is known for its durability, and the Hydra-Matic transmission is generally considered to be robust. However, like any vehicle, regular maintenance is crucial to ensure long-term reliability. Common issues include oil leaks, sensor failures, and wear and tear on suspension components. Today, these trucks remain popular among those seeking a capable and affordable heavy-duty pickup, offering a blend of power, comfort, and practicality.
