The GMC Sierra 3500HD IV, produced between 2015 and 2019, represents the fourth generation of GMC’s heavy-duty full-size pickup truck. This iteration, based on the GMTK2XX platform, was a significant update to the Sierra line, focusing on increased capability, refinement, and technology. The Double Cab Long Box configuration, paired with the 6.0-liter V8 engine and a six-speed automatic transmission, occupied a sweet spot in the lineup, offering a balance of power, space, and usability for both work and family needs. This particular variant was aimed at buyers needing substantial towing and payload capacity without opting for the more expensive and powerful diesel options.
Technical Specifications
| Brand | GMC |
| Model | Sierra 3500HD |
| Generation | Sierra 3500HD IV (GMTK2XX) Double 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 | 5 |
| Doors | 4 |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 8.1 kg/Hp, 124 Hp/tonne |
| Weight-to-torque ratio | 5.6 kg/Nm, 177.3 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 | 2904 kg (6402.22 lbs.) |
| Max. weight | 4853 kg (10699.03 lbs.) |
| Max load | 1949 kg (4296.81 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%) | 6441 kg (14199.97 lbs.) |
| Length | 6321 mm (248.86 in.) |
| Width including mirrors | 2045 mm (80.51 in.) |
| Height | 1981 mm (77.99 in.) |
| Wheelbase | 4017 mm (158.15 in.) |
| Front track | 1748 mm (68.82 in.) |
| Rear (Back) track | 1709 mm (67.28 in.) |
| Ride height (ground clearance) | 221 mm (8.7 in.) |
| Minimum turning circle (turning diameter) | 16.2 m (53.15 ft.) |
| Drivetrain Architecture | 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 |
Powertrain & Engine Architecture
The heart of this Sierra 3500HD is the Vortec L96 6.0-liter V8 engine. This engine, a member of the Vortec family, is a cast iron block, overhead valve (OHV) design. It utilizes a multi-port fuel injection system for precise fuel delivery and variable valve timing (VVT) to optimize performance and efficiency across the rev range. The L96 produces 360 horsepower at 5400 rpm and 380 lb-ft of torque at 4200 rpm. The engine’s longitudinal mounting and rear-wheel-drive configuration are typical for heavy-duty trucks. Paired with the engine is the Hydra-Matic 6L90 six-speed automatic transmission. This transmission is known for its durability and smooth shifting, providing adequate gear ratios for both towing and everyday driving. The 6L90 features electronic controls for optimized shift points and a tow/haul mode for improved performance when hauling heavy loads.
Driving Characteristics
The 6.0L V8 and 6-speed automatic combination delivers a capable, if not exhilarating, driving experience. While not as quick as some of the lighter-duty pickups or those equipped with the diesel engine, the Sierra 3500HD provides ample power for most tasks. The automatic transmission is well-tuned, offering smooth shifts and responsive downshifts when needed. The gear ratios are optimized for towing, allowing the truck to maintain speed and control even when hauling heavy loads. Compared to the manual transmission options, the automatic prioritizes ease of use and convenience, making it a popular choice for drivers who frequently encounter stop-and-go traffic or long distances. However, the automatic does result in a slight decrease in fuel economy compared to the manual.
Equipment & Trim Levels
The Double Cab Long Box 6.0L Automatic trim typically included standard features such as air conditioning, power windows and locks, a basic audio system, and vinyl upholstery. Higher trim levels, like the SLT and Denali, added features such as leather upholstery, heated seats, a premium audio system, navigation, and advanced safety technologies. Optional extras included a sunroof, upgraded wheels, and various towing packages. The Double Cab configuration offered a spacious interior with seating for five passengers, making it suitable for both work crews and families. The Long Box provided ample cargo space for hauling tools, equipment, or personal belongings.
Chassis & Braking
The Sierra 3500HD features a robust chassis designed to handle heavy loads. The front suspension utilizes coil springs and a double wishbone design, while the rear suspension employs a traditional leaf spring setup. This combination 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, enhancing safety and control during emergency braking situations. The truck’s heavy-duty frame and suspension components contribute to its impressive towing and payload capabilities.
Market Reception & Comparison
The GMC Sierra 3500HD with the 6.0L V8 and automatic transmission was generally well-received by critics and consumers. It was praised for its strong towing capacity, comfortable ride, and user-friendly features. Compared to the Duramax diesel engine option, the 6.0L V8 offered a lower initial cost but sacrificed some towing capacity and fuel economy. Compared to the lighter-duty Sierra 1500, the 3500HD provided significantly increased payload and towing capabilities. Fuel economy was typical for a heavy-duty pickup truck, averaging around 14-16 mpg in combined driving.
Legacy
The GMTK2XX generation Sierra 3500HD, particularly the 6.0L V8 automatic variant, has proven to be a reliable and durable truck. The Vortec L96 engine is known for its longevity and relatively simple maintenance requirements. On the used car market, these trucks remain popular choices for buyers seeking a capable and affordable heavy-duty pickup. While newer models offer more advanced technology and features, the GMTK2XX Sierra 3500HD continues to provide a solid and dependable workhorse for a variety of applications. Common maintenance items include regular oil changes, transmission fluid flushes, and inspection of the suspension and braking components. Overall, this variant represents a well-rounded and capable truck that has stood the test of time.
