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

The GMC Sierra 3500HD IV (GMTK2XX) Regular Cab Long Box, equipped with the 6.0-liter V8 engine producing 360 horsepower and paired with a four-wheel-drive dual rear wheel (DRW) automatic transmission, was a mainstay of GMC’s heavy-duty truck lineup from the 2015 to 2019 model years. This configuration represented a work-focused variant within the fourth generation of the Sierra 3500HD, designed for demanding tasks like towing and hauling. It occupied a middle ground in the lineup, offering a balance between capability and cost, positioned below the more powerful diesel options and above the lighter-duty configurations.

Technical Specifications

INTRODUCTION

The GMC Sierra 3500HD IV, specifically the Regular Cab Long Box configuration with the 6.0-liter V8 and automatic transmission, was produced between 2015 and 2019. It falls within the GMTK2XX platform generation, representing a significant redesign for GMC’s heavy-duty trucks. This generation focused on improving interior refinement, ride quality, and towing capacity while maintaining the rugged durability expected of a work truck. The Regular Cab configuration, combined with the long bed, catered to buyers prioritizing cargo space and functionality over passenger comfort. The DRW (Dual Rear Wheel) setup further enhanced its towing and hauling capabilities, making it a popular choice for commercial users and those with substantial towing needs.

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 the 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. The L96 employs a traditional overhead valve (OHV) valvetrain with variable valve timing (VVT) to optimize performance and fuel efficiency. Fuel delivery is managed by a multi-port fuel injection system. The engine produces 360 horsepower at 5400 rpm and 380 lb-ft (515 Nm) of torque at 4200 rpm.

The engine is mated to a six-speed Hydra-Matic automatic transmission. This transmission was designed to handle the high torque output of the V8 engine and provide smooth, reliable shifting. The automatic transmission offered convenience and ease of use, particularly for drivers frequently operating in stop-and-go traffic or towing heavy loads. The DRW configuration, with its wider stance and increased stability, works in conjunction with the powertrain to maximize towing capacity.

Driving Characteristics

The 6.0-liter V8 and six-speed automatic combination in the Sierra 3500HD delivered adequate, though not exceptional, performance. Acceleration was respectable for a heavy-duty truck, but the focus was clearly on providing ample low-end torque for towing and hauling. The automatic transmission’s gear ratios were optimized for work, prioritizing pulling power over quick acceleration. Compared to the available Duramax diesel engine, the 6.0-liter V8 offered less torque and lower fuel economy, but it was significantly less expensive to purchase and maintain. Compared to a manual transmission equipped version, the automatic offered less driver control but greater ease of use, especially in challenging conditions.

Equipment & Trim Levels

The Sierra 3500HD Regular Cab typically came with a relatively basic level of standard equipment, reflecting its work-oriented nature. Standard features generally included air conditioning, a basic audio system, vinyl upholstery, and manual windows and locks. Higher trim levels, such as the SLE and Denali, added features like power windows and locks, upgraded audio systems, leather upholstery, and more advanced infotainment systems. Optional extras for this variant included a trailer brake controller, a locking rear differential, and various towing packages. The interior was functional and durable, designed to withstand the rigors of daily use.

Chassis & Braking

The Sierra 3500HD’s chassis was built for heavy-duty applications. The front suspension utilized coil springs and a double wishbone design with a transverse stabilizer bar, while the rear suspension employed a traditional leaf spring setup. This configuration provided a comfortable ride, even when the truck was heavily loaded. The braking system featured ventilated discs at all four wheels, providing ample stopping power. An Anti-lock Braking System (ABS) was standard. The DRW configuration significantly increased the truck’s stability and braking performance when towing heavy loads.

Market Reception & Comparison

The 6.0-liter V8-powered Sierra 3500HD was generally well-received by critics as a capable and affordable work truck. While the diesel engine offered superior performance and fuel economy, the V8 provided a more accessible entry point into the heavy-duty truck market. Fuel economy was typical for a gasoline-powered heavy-duty truck, averaging around 14-16 mpg in combined driving. Reliability was generally good, although the Vortec L96 engine was known to be susceptible to oil consumption issues in some cases. Compared to competitors like the Ford F-350 and Ram 3500, the Sierra 3500HD offered a competitive combination of capability, features, and price.

Legacy

The GMC Sierra 3500HD IV (GMTK2XX) with the 6.0-liter V8 and automatic transmission remains a popular choice in the used truck market. Its robust construction and relatively simple mechanical design make it a relatively easy and affordable truck to maintain. While the diesel variants command higher prices, the 6.0-liter V8 offers a compelling value proposition for buyers who don’t require the ultimate in towing capacity or fuel economy. The powertrain, while not without its quirks, has proven to be reasonably durable over the long term, making it a reliable workhorse for years to come.