2015-2019 GMC Sierra 3500HD IV (GMTK2XX) Double Cab Long Box 6.0 V8 (360 Hp) 4WD DRW Automatic

The GMC Sierra 3500HD IV (GMTK2XX) Double Cab Long Box, equipped with the 6.0-liter V8 engine producing 360 horsepower and paired with a four-wheel drive (4WD) and dual rear wheel (DRW) configuration, was a mainstay of GMC’s heavy-duty truck lineup from 2015 to 2019. This variant represented a balance between capability and everyday usability within the Sierra 3500HD range, targeting buyers needing substantial towing and hauling capacity without necessarily opting for the highest trim levels or diesel power. It occupied a significant position in the North American heavy-duty truck market, catering to contractors, ranchers, and individuals requiring a robust work truck.

Technical Specifications

INTRODUCTION

The fourth-generation GMC Sierra 3500HD (GMTK2XX platform) debuted in 2015, representing a significant upgrade in terms of capability, refinement, and technology compared to its predecessors. The Double Cab Long Box configuration offered a spacious cabin and a long bed, making it a versatile option for both work and family use. The 6.0-liter V8 engine, designated the Vortec L96, was a gasoline engine option positioned below the more powerful and expensive Duramax diesel. This particular combination – the 6.0L V8, 4WD, DRW, and automatic transmission – aimed to provide a strong towing and hauling experience for customers who preferred the simplicity and lower upfront cost of a gasoline engine.

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 reliable performance. It features a cast iron block and aluminum cylinder heads. The L96 utilizes a multi-port fuel injection system, delivering fuel directly to each cylinder. The engine employs an overhead valve (OHV) valvetrain with variable valve timing (VVT) to optimize performance and fuel efficiency across a wider range of engine speeds. The Hydra-Matic 6L90E six-speed automatic transmission was the standard transmission for this configuration. This transmission is known for its durability and smooth shifting characteristics, and its gear ratios are optimized for towing and hauling. The 4WD system is a traditional part-time system, allowing the driver to switch between two-wheel drive and four-wheel drive as needed.

Driving Characteristics

The 6.0-liter V8, while not as powerful as the Duramax diesel, provided ample torque for most heavy-duty tasks. The 360 horsepower and 380 lb-ft of torque allowed for confident acceleration and the ability to tow substantial loads. The six-speed automatic transmission helped to keep the engine in its optimal power band, providing smooth and responsive shifts. However, compared to the manual transmission option or the diesel engine, the 6.0L automatic felt less directly connected and had a slightly slower response time. The DRW configuration significantly enhanced stability when towing heavy trailers, distributing the weight more evenly across the rear axle. The ride quality, while typical for a heavy-duty truck, was generally comfortable, especially when unloaded.

Equipment & Trim Levels

The Sierra 3500HD Double Cab Long Box 6.0L 4WD DRW Automatic typically came standard with features such as air conditioning, power windows and locks, a basic audio system, and vinyl upholstery. Higher trim levels, such as SLE and SLT, added features like leather upholstery, heated seats, a premium audio system, and a navigation system. Optional extras included a trailer brake controller, a rearview camera, and various appearance packages. The Double Cab configuration offered a spacious rear seat, making it suitable for carrying passengers in addition to cargo. The Long Box provided a generous cargo bed length, ideal for hauling large items.

Chassis & Braking

The Sierra 3500HD featured a robust chassis designed to withstand heavy loads. The front suspension utilized coil springs and a double wishbone design, while the rear suspension employed leaf springs. This setup provided a good balance between ride comfort and load-carrying capacity. The braking system consisted of ventilated discs on all four wheels, providing ample stopping power. An Anti-lock Braking System (ABS) was standard, enhancing safety during emergency braking situations. The DRW configuration featured larger, heavier-duty axles and suspension components to handle the increased weight capacity.

Market Reception & Comparison

Critics generally praised the Sierra 3500HD for its robust construction, comfortable interior, and capable powertrain. The 6.0-liter V8 was seen as a good option for buyers who didn’t need the extreme towing capacity of the Duramax diesel. However, it was often criticized for its lower fuel economy compared to the diesel engine. Compared to the 6.6L Duramax diesel, the 6.0L V8 offered significantly less torque, resulting in lower maximum towing and payload capacities. The 6.0L was also generally considered less refined and noisier than the diesel. However, the 6.0L engine was simpler to maintain and less expensive to repair than the diesel.

Legacy

The GMC Sierra 3500HD IV (GMTK2XX) with the 6.0-liter V8 and automatic transmission has proven to be a relatively reliable powertrain combination. The Vortec L96 engine is known for its durability, and the 6L90E transmission is also generally considered to be a robust unit. In the used car market, these trucks remain popular among buyers seeking a capable and affordable heavy-duty truck. While the diesel models command a higher price, the 6.0L V8 variants offer a compelling value proposition for those who don’t require the ultimate in towing and hauling performance. Regular maintenance, including oil changes and transmission fluid flushes, is crucial to ensuring the long-term reliability of this powertrain.