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 4WD SRW automatic transmission, was a mainstay of GMC’s heavy-duty truck lineup from 2015 to 2019. This configuration represented a balance between capability and affordability within the Sierra 3500HD range, targeting customers needing serious towing and hauling capacity without the premium features of higher trim levels. It served as a workhorse for commercial users, ranchers, and those requiring a robust pickup for demanding tasks.
Technical Specifications
| Brand | GMC |
| Model | Sierra 3500HD |
| Generation | Sierra 3500HD IV (GMTK2XX) Regular Cab Long Box |
| Type (Engine) | 6.0 V8 (360 Hp) 4WD SRW Automatic |
| Start of production | 2015 |
| End of production | 2019 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 2 |
| Doors | 2 |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 7.9 kg/Hp, 126.4 Hp/tonne |
| Weight-to-torque ratio | 5.5 kg/Nm, 180.8 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 | 2849 kg, 6280.97 lbs. |
| Max. weight | 4853 kg, 10699.03 lbs. |
| Max load | 2004 kg, 4418.06 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%) | 6486 kg, 14299.18 lbs. |
| Length | 5699 mm, 224.37 in. |
| Width including mirrors | 2035 mm, 80.12 in. |
| Height | 1979 mm, 77.91 in. |
| Wheelbase | 3393 mm, 133.58 in. |
| Front track | 1748 mm, 68.82 in. |
| Rear (Back) track | 1709 mm, 67.28 in. |
| Ride height (ground clearance) | 220 mm, 8.66 in. |
| Minimum turning circle (turning diameter) | 14 m, 45.93 ft. |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the rear wheels permanently, and the front wheels are driven through an electrically or mechanically operated clutch if necessary. |
| Drive wheel | All wheel drive (4×4) |
| 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 |
INTRODUCTION
The GMC Sierra 3500HD IV, produced between 2015 and 2019, represented the fourth generation of GMC’s heavy-duty pickup truck line (GMTK2XX platform). This generation saw significant improvements in capability, refinement, and technology compared to its predecessors. The Regular Cab Long Box configuration, combined with the 6.0-liter V8 and 4WD automatic drivetrain, was positioned as a robust and practical option for buyers prioritizing work capability over luxury features. It slotted below the Denali trim and diesel-powered variants in terms of price and features, making it accessible to a wider range of customers.
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 GM’s small-block V8 family, known for its durability and relatively simple design. 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 intake port. 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 engine is mated to a six-speed Hydra-Matic automatic transmission. This transmission is designed to handle the high torque output of the V8 engine and provide smooth and reliable shifting. The automatic transmission was favored by many buyers for its ease of use, particularly in demanding work applications and towing scenarios. 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 and six-speed automatic combination in the Sierra 3500HD delivered adequate, though not exhilarating, performance. Acceleration was sufficient for everyday driving and hauling moderate loads. However, compared to the available 6.6-liter Duramax diesel engine, the V8 felt less powerful, especially when towing heavy trailers. The automatic transmission provided smooth shifts, but could sometimes hunt for the right gear when climbing hills or under heavy load. The gear ratios were optimized for towing and hauling, prioritizing low-end torque over outright speed. The ride quality, while improved over previous generations, remained truck-like, reflecting the vehicle’s heavy-duty nature.
Equipment & Trim Levels
The base Sierra 3500HD Regular Cab Long Box typically came standard with features like air conditioning, a basic audio system, vinyl upholstery, and manual windows and locks. The 6.0L V8 trim often included upgrades like power windows and locks, keyless entry, and a slightly more refined interior trim. Optional extras included a trailer brake controller, upgraded audio systems, and various towing packages. The interior was functional and durable, designed to withstand the rigors of work use. The Regular Cab configuration offered limited passenger space, making it best suited for single drivers or those occasionally carrying a passenger.
Chassis & Braking
The Sierra 3500HD IV featured a robust chassis designed to handle heavy loads. The front suspension utilized coil springs and a double wishbone setup, while the rear suspension employed a traditional leaf spring design. This configuration provided a good balance of 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. The rear axle was a solid axle, contributing to the truck’s durability and towing capacity.
Market Reception & Comparison
Critics generally praised the Sierra 3500HD IV for its robust construction, capable powertrain options, and improved interior compared to previous generations. However, the 6.0-liter V8/automatic combination was often seen as a compromise. While it offered good value, it lacked the sheer towing power and fuel efficiency of the Duramax diesel engine. Compared to the Ford Super Duty and Ram Heavy Duty trucks, the Sierra 3500HD was considered competitive in terms of capability and features, but some reviewers noted that the interior design was less modern than its rivals. Fuel economy was typical for a heavy-duty pickup truck, averaging around 14-16 mpg in mixed driving.
Legacy
The GMC Sierra 3500HD IV 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 Hydra-Matic transmission is generally dependable when properly maintained. On the used car market, these trucks remain popular among buyers seeking a capable and affordable heavy-duty pickup. While the diesel variants command higher prices, the 6.0-liter V8 models offer a compelling value proposition for those who don’t require the ultimate in towing capacity. Regular maintenance, including oil changes and transmission fluid flushes, is crucial for ensuring the long-term reliability of these trucks.
