The GMC Sierra 3500HD IV, produced from 2015 to 2019, represents the fourth generation of GMC’s heavy-duty full-size pickup truck line (GMTK2XX platform). This particular variant, the Regular Cab Long Box configuration equipped with the 6.0-liter V8 engine producing 360 horsepower and paired with a six-speed automatic transmission, served as a work-focused offering within the Sierra 3500HD range. It was positioned as a robust, capable truck aimed at customers prioritizing towing and hauling capacity over luxury or passenger space. This model year marked a significant refresh for the Sierra HD line, incorporating updated styling and enhanced features compared to previous generations.
Technical Specifications
| Brand | GMC |
| Model | Sierra 3500HD |
| Generation | Sierra 3500HD IV (GMTK2XX) Regular 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 | 2 |
| Doors | 2 |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 7.5 kg/Hp, 132.6 Hp/tonne |
| Weight-to-torque ratio | 5.3 kg/Nm, 189.8 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 | 2714 kg, 5983.35 lbs. |
| Max. weight | 4717 kg, 10399.2 lbs. |
| Max load | 2003 kg, 4415.86 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%) | 6577 kg, 14499.8 lbs. |
| Length | 5699 mm, 224.37 in. |
| Width including mirrors | 2035 mm, 80.12 in. |
| Height | 1977 mm, 77.83 in. |
| Wheelbase | 3393 mm, 133.58 in. |
| Front track | 1748 mm, 68.82 in. |
| Rear (Back) track | 1709 mm, 67.28 in. |
| Ride height (ground clearance) | 229 mm, 9.02 in. |
| Minimum turning circle (turning diameter) | 14 m, 45.93 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 |
INTRODUCTION
The 2015-2019 GMC Sierra 3500HD with the 6.0L V8 and automatic transmission was a mainstay of GMC’s heavy-duty truck lineup. Built on the GMTK2XX platform, this generation represented a significant step forward in refinement and capability. The Regular Cab Long Box configuration, combined with the 6.0L engine, specifically targeted buyers needing a powerful and practical work truck. It offered a balance between capability and affordability within the Sierra 3500HD range, slotting below the more expensive Duramax diesel options and the higher trim levels.
Powertrain & Engine Architecture
At the heart of this Sierra 3500HD variant 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. It features a cast iron block and aluminum cylinder heads, utilizing a 9.6:1 compression ratio and a multi-port fuel injection system. The engine employs an overhead valve (OHV) valvetrain with variable valve timing (VVT) to optimize performance and efficiency. The L96 produces 360 horsepower at 5400 rpm and 380 lb-ft (515 Nm) of torque at 4200 rpm. This power is delivered through a six-speed Hydra-Matic automatic transmission, chosen for its durability and ability to handle the engine’s torque output. The transmission features electronically controlled shifting and tow/haul mode for optimized performance when towing heavy loads.
Driving Characteristics
The 6.0L V8 and six-speed automatic combination in the Sierra 3500HD provides a solid, if not particularly sporty, driving experience. Compared to the more powerful Duramax diesel engine, the 6.0L offers less low-end torque, requiring the transmission to downshift more frequently when towing or hauling heavy loads. However, the gasoline engine provides a more responsive feel at higher RPMs. The Hydra-Matic transmission is well-tuned, offering smooth shifts under normal driving conditions. The gear ratios are optimized for towing, with a relatively deep first gear to get heavy loads moving. While not as fuel-efficient as the diesel counterpart, the 6.0L provides a more familiar and generally less expensive ownership experience.
Equipment & Trim Levels
The Regular Cab Long Box 6.0L Sierra 3500HD typically came standard with basic work truck features. This included vinyl upholstery, a basic audio system, air conditioning, and power windows and locks. The interior was functional and durable, designed to withstand the rigors of daily work use. Optional extras included upgraded audio systems, power-adjustable seats, a rearview camera, and various towing packages. Higher trim levels, such as SLE and Denali, added more luxurious features like leather upholstery, heated seats, and advanced infotainment systems, but these were not typically paired with the base 6.0L engine.
Chassis & Braking
The Sierra 3500HD’s chassis is built for heavy-duty use. It features a fully boxed frame and a robust suspension system designed to handle significant payloads and towing capacities. The front suspension utilizes coil springs and a double wishbone design with a transverse stabilizer bar. The rear suspension employs a traditional leaf spring setup, providing excellent load-carrying capability. Braking duties are handled by ventilated disc brakes on all four wheels, with ABS (Anti-lock Braking System) standard. The front brakes measure 355x40mm, while the rear brakes are 373x34mm. The steering system is a cone worm with recirculation balls, providing a solid and predictable feel.
Market Reception & Comparison
The 6.0L V8-equipped Sierra 3500HD was generally well-received by critics as a capable and affordable work truck. While the Duramax diesel engine was often praised for its superior towing capacity and fuel economy, the 6.0L offered a lower initial cost and simpler maintenance. Compared to competitors like the Ford Super Duty and Ram 3500, the Sierra 3500HD offered a competitive combination of power, capability, and value. Fuel economy was typical for a heavy-duty pickup truck, averaging around 14-16 mpg in mixed 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 2015-2019 GMC Sierra 3500HD with the 6.0L V8 and automatic transmission remains a popular choice in the used truck market. Its robust powertrain and durable construction make it a reliable option for buyers needing a capable work truck. While the diesel variants command a higher price, the 6.0L offers a more affordable entry point into the heavy-duty pickup segment. The L96 engine is known for its longevity, and with proper maintenance, these trucks can provide many years of reliable service. The GMTK2XX platform proved to be a solid foundation, and these Sierra 3500HDs continue to be valued for their towing and hauling capabilities.
