The GMC Sierra 3500HD III, specifically the Crew Cab Long Box configuration with the 6.0-liter V8 engine and automatic transmission, 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 was aimed squarely at the American market, offering a blend of substantial towing capacity, interior space, and gasoline-powered performance. It occupied a middle ground within the 3500HD lineup, positioned above the base work trucks but below the more luxurious Denali trims. This model year saw refinements to the GMT900 series, enhancing both its capabilities and its appeal to buyers needing a robust, full-size pickup.
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) DRW 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 | 8.7 kg/Hp, 114.8 Hp/tonne |
| Weight-to-torque ratio | 6.1 kg/Nm, 164.3 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 | 3135 kg, 6911.49 lbs. |
| Max. weight | 5908 kg, 13024.91 lbs. |
| Max load | 2773 kg, 6113.42 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%) | 6124 kg, 13501.11 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 | 1906 mm, 75.04 in. |
| Ride height (ground clearance) | 213 mm, 8.39 in. |
| Minimum turning circle (turning diameter) | 16.9 m, 55.45 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, 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 |
INTRODUCTION
The 2011-2013 GMC Sierra 3500HD Crew Cab Long Box, powered by the 6.0-liter Vortec L96 V8 and paired with a six-speed Hydra-Matic automatic transmission, was a workhorse designed for demanding tasks. This generation represented a significant update to the GMT900 platform, focusing on increased capability and refinement. The “HD” designation signifies “Heavy Duty,” indicating its purpose-built nature for towing and hauling. The Crew Cab configuration offered expanded rear-seat space, making it suitable for both work and family use, while the Long Box provided ample cargo capacity. The dual rear wheels (DRW) configuration further enhanced its towing and payload capabilities, making it a popular choice for those needing serious truck power.
Powertrain & Engine Architecture
At the heart of this Sierra 3500HD lies the Vortec L96 6.0-liter V8 engine. This engine is a member of GM’s Vortec family, known for its robust construction and reliable performance. The L96 utilizes a cast iron block and aluminum cylinder heads. It features a 9.6:1 compression ratio and utilizes multi-port fuel injection for precise fuel delivery. The overhead valve (OHV) valvetrain, while traditional, is durable and relatively simple to maintain. Variable valve timing (VVT) was incorporated to improve fuel efficiency and low-end torque. The engine produces 360 horsepower at 5400 rpm and 515 lb-ft of torque at 4200 rpm. The Hydra-Matic 6L80E six-speed automatic transmission was the sole transmission option for this configuration. This transmission is known for its smooth shifting and durability, and its six forward gears help optimize engine efficiency and provide a wider range of ratios for towing and hauling.
Driving Characteristics
The 6.0-liter V8 and six-speed automatic combination delivered a capable, if not particularly sporty, driving experience. The truck’s substantial weight (over 7,000 lbs) is immediately apparent, but the engine’s ample torque provides strong acceleration, especially when unladen. The automatic transmission shifts smoothly and predictably, and the six gears allow the engine to remain in its optimal power band during most driving situations. Compared to the available Duramax diesel engine, the 6.0L gasoline engine offered less low-end torque, requiring more frequent downshifts when towing heavy loads. However, it was significantly less expensive to purchase and maintain. The gear ratios in the 6L80E were tuned for towing, with lower gears providing strong pulling power, while higher gears allowed for relaxed highway cruising. Steering felt somewhat heavy, typical of heavy-duty trucks, but provided good feedback.
Equipment & Trim Levels
The Crew Cab Long Box 3500HD offered a comfortable and well-equipped interior, even in its base trim. Standard features included air conditioning, power windows and locks, a CD player with auxiliary input, and cloth upholstery. The specific trim level dictated the level of luxury. Higher trims added features such as leather upholstery, heated seats, a premium sound system, and a navigation system. Optional extras included a sunroof, rear-seat entertainment system, and various towing packages. The spacious Crew Cab provided ample room for five passengers, making it a practical choice for families or crews. The Long Box bed offered a substantial amount of cargo space, and a variety of bed liners and tie-down systems were available.
Chassis & Braking
The Sierra 3500HD’s chassis was designed for heavy-duty use. It featured a fully boxed frame for increased rigidity and durability. The front suspension utilized an independent torsion bar setup with double wishbones, providing a comfortable ride and good handling. The rear suspension employed a traditional leaf spring setup, optimized for load-carrying capacity. Braking duties were handled by ventilated disc brakes at all four corners, providing ample stopping power. An Anti-lock Braking System (ABS) was standard. The DRW configuration significantly increased the truck’s stability when towing heavy loads. Steering was accomplished via a cone worm with recirculation balls system.
Market Reception & Comparison
The 2011-2013 GMC Sierra 3500HD with the 6.0-liter V8 and automatic transmission was generally well-received by critics and consumers. It was praised for its robust construction, ample towing capacity, and comfortable interior. However, its fuel economy was a common criticism, as expected for a large, gasoline-powered truck. Compared to the Duramax diesel option, the 6.0L V8 offered a lower purchase price and simpler maintenance, but sacrificed some towing performance and fuel efficiency. Against competitors like the Ford Super Duty and Ram Heavy Duty, the Sierra 3500HD held its own, offering a compelling combination of capability, comfort, and value.
Legacy
The Vortec L96 6.0-liter V8, paired with the 6L80E automatic transmission, proved to be a reliable and durable powertrain combination. While not as fuel-efficient as the diesel options, it offered a cost-effective alternative for those who didn’t require the ultimate in towing performance. Today, these trucks are readily available on the used market and continue to be popular choices for those needing a capable and affordable heavy-duty pickup. Regular maintenance, including oil changes and transmission fluid flushes, is crucial for ensuring the long-term reliability of this powertrain. The GMT900 platform, and this variant specifically, remains a testament to GMC’s commitment to building tough and dependable trucks.
