The GMC Sierra 3500HD IV, produced from 2015 to 2019, represents the fourth generation of GMC’s heavy-duty full-size pickup truck. This iteration, based on the GMTK2XX platform, was designed to offer increased capability, refinement, and technology compared to its predecessors. The Double Cab Long Box configuration, paired with the 6.0-liter Vortec L96 V8 engine producing 360 horsepower, and a six-speed Hydra-Matic automatic transmission, was a popular choice for buyers needing substantial towing and hauling capacity combined with passenger space. This particular variant occupied a strong mid-range position within the Sierra 3500HD lineup, offering a balance between performance, features, and cost.
Technical Specifications
| Brand | GMC |
| Model | Sierra 3500HD |
| Generation | Sierra 3500HD IV (GMTK2XX) Double 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 | 8.5 kg/Hp, 117.3 Hp/tonne |
| Weight-to-torque ratio | 6 kg/Nm, 167.8 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 | 3069 kg, 6765.99 lbs. |
| Max. weight | 5908 kg, 13024.91 lbs. |
| Max load | 2839 kg, 6258.92 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%) | 6260 kg, 13800.94 lbs. |
| Length | 6321 mm, 248.86 in. |
| Width including mirrors | 2438 mm, 95.98 in. |
| Height | 1972 mm, 77.64 in. |
| Wheelbase | 4017 mm, 158.15 in. |
| Front track | 1748 mm, 68.82 in. |
| Rear (Back) track | 1906 mm, 75.04 in. |
| Ride height (ground clearance) | 213 mm, 8.39 in. |
| Minimum turning circle (turning diameter) | 16.1 m, 52.82 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 |
| 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 6.0-liter Vortec L96 V8 engine. This engine is a member of the Vortec family, known for its robust construction and reliable performance. The L96 features a cast iron block and aluminum cylinder heads, contributing to its durability. It utilizes a multi-port fuel injection system for precise fuel delivery and is equipped with a single camshaft controlling valve timing. The engine’s 9.6:1 compression ratio strikes a balance between power and efficiency. The six-speed Hydra-Matic automatic transmission, a General Motors design, was specifically chosen for its ability to handle the high torque output of the L96 engine and provide smooth, reliable shifting. This transmission features electronically controlled shifting and overdrive for improved fuel economy at highway speeds.
Driving Characteristics
The 6.0-liter V8 and six-speed automatic combination in the Sierra 3500HD delivers a capable, though not overtly sporty, driving experience. While not as quick as some of the diesel-powered or higher-output gasoline variants, the L96 provides ample power for everyday driving and towing. The automatic transmission is tuned for smooth operation and prioritizes hauling capability over aggressive acceleration. The gear ratios are optimized for towing, providing strong low-end torque. Compared to the available Duramax diesel engine, this gasoline variant offers a quieter and smoother ride, but sacrifices fuel economy and ultimate towing capacity. Compared to a manual transmission equipped version, the automatic provides ease of use, especially in heavy traffic or when towing, but may feel slightly less responsive.
Equipment & Trim Levels
The Double Cab Long Box 6.0L configuration typically came standard with features like air conditioning, power windows and locks, a basic audio system, and vinyl upholstery. Higher trim levels, such as the SLT and Denali, added features like leather upholstery, heated seats, a premium audio system, navigation, and advanced safety technologies. Optional extras included a trailer brake controller, a rearview camera, and various appearance packages. The Double Cab configuration offered a spacious interior with seating for five passengers, making it suitable for both work and family use.
Chassis & Braking
The Sierra 3500HD features a heavy-duty chassis designed to withstand the stresses of hauling and towing. 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 even when heavily loaded. An Anti-lock Braking System (ABS) is standard, enhancing safety and control during emergency braking situations.
Market Reception & Comparison
The 6.0-liter V8-powered Sierra 3500HD was generally well-received by critics and consumers alike. It was praised for its robust engine, comfortable ride, and spacious interior. However, its fuel economy was often criticized, particularly when compared to the diesel-powered alternatives. In terms of reliability, the L96 engine proved to be relatively dependable, although regular maintenance was crucial. Compared to the 6.6-liter Duramax diesel, the 6.0L offered a lower initial cost but significantly less towing capacity and fuel efficiency. The gasoline engine was often favored by buyers who did not require the extreme towing capabilities of the diesel and preferred a quieter, smoother driving experience.
Legacy
The GMTK2XX generation Sierra 3500HD, and specifically the 6.0-liter V8/automatic combination, has established a solid reputation for durability and capability. On the used car market, these trucks remain popular choices for buyers seeking a reliable and affordable heavy-duty pickup. While the L96 engine is known for its longevity, regular maintenance, including oil changes and cooling system upkeep, is essential to prevent potential issues. The availability of parts and experienced mechanics ensures that these trucks can be kept on the road for many years to come. The combination of a spacious cabin, strong V8 power, and a capable chassis makes this Sierra 3500HD a practical and enduring workhorse.
