The GMC Sierra 3500HD IV, produced from 2015 to 2019, represents the fourth generation of GMC’s heavy-duty full-size pickup truck. This generation, designated GMTK2XX, offered a significant upgrade in capability, refinement, and technology compared to its predecessors. The Crew Cab Long Box configuration, paired with the 6.0-liter V8 engine producing 360 horsepower and mated to a six-speed automatic transmission, was a popular choice for buyers needing substantial towing and hauling capacity combined with passenger comfort. This particular variant occupied a middle ground in the Sierra 3500HD lineup, offering a balance between the more affordable base models and the more powerful Duramax diesel options.
Technical Specifications
| Brand | GMC |
| Model | Sierra 3500HD |
| Generation | Sierra 3500HD IV (GMTK2XX) Crew Cab Long Box |
| Type (Engine) | 6.0 V8 (360 Hp) SRW Automatic |
| Start of production | 2015 |
| End of production | 2019 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 5 |
| Doors | 4 |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 8.2 kg/Hp, 121.6 Hp/tonne |
| Weight-to-torque ratio | 5.7 kg/Nm, 173.9 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 | 16.1 l, 17.01 US qt | 14.17 UK qt |
| Kerb Weight | 2961 kg, 6527.89 lbs. |
| Max. weight | 4853 kg, 10699.03 lbs. |
| Max load | 1892 kg, 4171.15 lbs. |
| Trunk (boot) space – maximum | 2162 l, 76.35 cu. ft. |
| Fuel tank capacity | 136 l, 35.93 US gal | 29.92 UK gal |
| Permitted trailer load with brakes (12%) | 6396 kg, 14100.77 lbs. |
| Length | 6563 mm, 258.39 in. |
| Width including mirrors | 2045 mm, 80.51 in. |
| Height | 1979 mm, 77.91 in. |
| Wheelbase | 4259 mm, 167.68 in. |
| Front track | 1748 mm, 68.82 in. |
| Rear (Back) track | 1709 mm, 67.28 in. |
| Ride height (ground clearance) | 214 mm, 8.43 in. |
| Minimum turning circle (turning diameter) | 17.1 m, 56.1 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 | Coil spring, Double wishbone, Transverse stabilizer |
| 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 |
| Wheel rims size | 7.5J x 17; 8J x 18 |
Powertrain & Engine Architecture
The heart of this Sierra 3500HD variant is the Vortec L96 6.0-liter V8 engine. This engine is a member of the Vortec family, known for its robust construction and relatively simple design. It features a cast iron block and aluminum cylinder heads. The L96 utilizes a traditional overhead valve (OHV) valvetrain with variable valve timing (VVT) to optimize performance and fuel efficiency. Fuel delivery is handled by a multi-port fuel injection system, providing precise fuel metering. The engine produces 360 horsepower at 5400 rpm and 380 lb-ft of torque at 4200 rpm. The Hydra-Matic 6L80 six-speed automatic transmission is paired with the L96. This transmission is known for its durability and smooth shifting characteristics. The transmission’s gear ratios are tuned for towing and hauling, prioritizing low-end torque over outright acceleration.
Driving Characteristics
The 6.0L V8 and 6-speed automatic combination in the Sierra 3500HD delivers a capable, if not exhilarating, driving experience. Compared to the available 6.6-liter Duramax diesel engine, the 6.0L offers less torque, resulting in slower acceleration and a lower maximum towing capacity. However, it provides a smoother and quieter ride, and is significantly less expensive to maintain. The automatic transmission shifts smoothly and predictably, making it easy to drive in a variety of conditions. The gear ratios are well-suited for towing, providing ample power for climbing hills and maintaining speed on the highway. Compared to the manual transmission option, the automatic offers greater convenience, especially in stop-and-go traffic. However, it does result in a slight reduction in fuel economy.
Equipment & Trim Levels
The 6.0L V8/automatic combination was available on several trim levels of the Sierra 3500HD, including the SLE and SLT. Standard features typically included air conditioning, power windows and locks, a rearview camera, and a basic infotainment system. Higher trim levels, such as the SLT, added features like leather upholstery, heated and ventilated front seats, a premium sound system, and advanced safety technologies. Optional extras included a navigation system, a sunroof, and a variety of towing packages. The Crew Cab configuration provided ample space for passengers, making it a comfortable choice for families or work crews.
Chassis & Braking
The Sierra 3500HD features a body-on-frame construction, providing a robust and durable platform for heavy-duty use. The front suspension utilizes a coil spring, double wishbone design with a transverse stabilizer bar, while the rear suspension employs a traditional leaf spring setup. This configuration provides a comfortable ride while maintaining excellent load-carrying capacity. Braking duties are handled by ventilated disc brakes on all four wheels. An Anti-lock Braking System (ABS) is standard, enhancing safety and control during emergency braking situations. The rear axle is a solid axle, contributing to the truck’s towing and hauling capabilities.
Market Reception & Comparison
The 6.0L V8-equipped Sierra 3500HD was generally well-received by critics and consumers. It was praised for its comfortable ride, spacious interior, and strong towing capacity. However, some reviewers noted that the engine lacked the power and fuel efficiency of the Duramax diesel option. Compared to the diesel, the 6.0L offered a lower purchase price and simpler maintenance requirements. Fuel economy was typical for a heavy-duty pickup truck, averaging around 14-16 mpg in combined driving. Reliability was generally good, although some owners reported issues with the active fuel management system, which deactivated cylinders to improve fuel economy.
Legacy
The GMTK2XX generation Sierra 3500HD, including the 6.0L V8/automatic variant, remains a popular choice in the used truck market. The L96 engine is known for its durability and relatively low maintenance costs. While not as powerful or fuel-efficient as the diesel options, the 6.0L V8 provides a reliable and capable powertrain for those who don’t require the ultimate in towing capacity. These trucks continue to be used for a variety of purposes, including work, recreation, and everyday transportation. Well-maintained examples can still command a reasonable price, reflecting their enduring reputation for toughness and dependability.
