The GMC Sierra 3500HD IV (GMTK2XX) Crew Cab Long Box, equipped with the 6.0-liter V8 engine and automatic transmission, represents a significant iteration in GMC’s heavy-duty truck lineage. Produced from 2015 to 2019, this variant occupied a crucial position in the Sierra 3500HD lineup, catering to buyers needing substantial towing and payload capacity without sacrificing interior space and comfort. It was part of the fourth generation of the Sierra/Silverado HD trucks, known as the GMTK2XX platform, which brought improvements in capability, refinement, and technology compared to its predecessors.
Technical Specifications
| Brand | GMC |
| Model | Sierra 3500HD |
| Generation | Sierra 3500HD IV (GMTK2XX) Crew Cab Long Box |
| Type (Engine) | 6.0 V8 (360 Hp) DRW 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 | 8.7 kg/Hp, 115.2 Hp/tonne |
| Weight-to-torque ratio | 6.1 kg/Nm, 164.9 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 | 3124 kg, 6887.24 lbs. |
| Max. weight | 5908 kg, 13024.91 lbs. |
| Max load | 2784 kg, 6137.67 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%) | 6214 kg, 13699.52 lbs. |
| Length | 6563 mm, 258.39 in. |
| Width including mirrors | 2438 mm, 95.98 in. |
| Height | 1976 mm, 77.8 in. |
| Wheelbase | 4259 mm, 167.68 in. |
| Front track | 1748 mm, 68.82 in. |
| Rear (Back) track | 1906 mm, 75.04 in. |
| Ride height (ground clearance) | 210 mm, 8.27 in. |
| Minimum turning circle (turning diameter) | 17 m, 55.77 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, 355×40 mm |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Cone worm with recirculation balls |
| Power steering | Electric Steering |
| 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 Crew Cab Long Box with the 6.0L V8 and automatic transmission was designed for the demanding needs of owners who frequently tow heavy loads. Positioned as a mid-range offering within the 3500HD lineup, it provided a balance between capability and affordability, slotting below the more powerful Duramax diesel options but offering more power than the base gasoline engines. The “DRW” designation indicates a Dual Rear Wheel configuration, further enhancing its towing and hauling capabilities. This truck was primarily sold in North America, specifically targeting customers in the construction, agriculture, and recreational vehicle sectors.
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. It features a cast iron block and aluminum cylinder heads, with a 9.6:1 compression ratio. The L96 utilizes a multi-port fuel injection system, delivering fuel directly to each cylinder. The valvetrain employs overhead valves (OHV) with variable valve timing (VVT) on the intake side, optimizing performance and efficiency. The engine produces 360 horsepower at 5400 rpm and 380 lb-ft of torque at 4200 rpm. The Hydra-Matic 6L90 six-speed automatic transmission was the standard pairing for this engine. This transmission is known for its durability and smooth shifting characteristics, and its gear ratios are optimized for towing and hauling.
Driving Characteristics
The 6.0L V8/automatic combination delivers adequate, though not exhilarating, performance. Acceleration is sufficient for everyday driving, but the truck’s substantial weight is noticeable. The automatic transmission provides smooth and predictable shifts, and the six gears help to keep the engine in its optimal power band. When towing, the truck feels stable and capable, with the dual rear wheels providing enhanced stability. Compared to the diesel-powered Sierra 3500HD models, this variant offers less low-end torque, requiring more frequent downshifts when climbing hills or hauling heavy loads. However, it is generally more responsive than the smaller displacement gasoline engines. The gear ratios in the 6L90 transmission are tuned for towing, meaning that highway cruising RPMs are slightly higher than in some other applications.
Equipment & Trim Levels
The Crew Cab configuration provides ample interior space for passengers, making it suitable for families or work crews. Standard features typically included air conditioning, power windows and locks, a basic audio system, and vinyl upholstery. Higher trim levels, such as the SLE and SLT, added features like leather upholstery, heated seats, a premium audio system, and a navigation system. Optional extras included a sunroof, rear-seat entertainment system, and various towing packages. The Long Box configuration provides a generous cargo bed length, ideal for hauling large items.
Chassis & Braking
The Sierra 3500HD features a robust chassis designed to withstand heavy loads. The front suspension utilizes coil springs and a double wishbone design, 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, providing ample stopping power. An Anti-lock Braking System (ABS) is standard. Due to the increased weight of the DRW configuration, the braking system is often upgraded compared to standard Sierra 3500HD models.
Market Reception & Comparison
Critics generally praised the GMC Sierra 3500HD for its robust construction, comfortable interior, and impressive towing capacity. The 6.0L V8/automatic combination was viewed as a good option for buyers who didn’t require the ultimate towing power of the Duramax diesel but still needed a capable truck. Fuel economy was a common criticism, as the 6.0L V8 is not particularly fuel-efficient. Compared to the diesel models, the gasoline engine offers lower maintenance costs, as it doesn’t require the expensive diesel-specific maintenance procedures. The 6.0L engine was also considered more reliable than the early iterations of the Duramax diesel.
Legacy
The GMTK2XX generation Sierra 3500HD, particularly the 6.0L V8/automatic variant, has proven to be a durable and reliable truck. On the used car market, these trucks hold their value relatively well, especially those that have been well-maintained. The Vortec L96 engine is known for its longevity, and the Hydra-Matic 6L90 transmission is also considered to be a robust unit. However, potential buyers should be aware of potential issues such as oil leaks and corrosion, particularly in areas with harsh winters. Overall, the 2015-2019 GMC Sierra 3500HD 6.0L V8 DRW remains a popular choice for those seeking a capable and reliable heavy-duty truck.
