The GMC Sierra 2500HD IV (GMTK2XX) Regular Cab Long Box, equipped with the 6.0-liter V8 engine producing 360 horsepower and paired with a four-wheel-drive 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 2500HD range, targeting buyers who needed serious towing and hauling capacity but didn’t require the luxury features of higher trim levels. It served as a workhorse for contractors, ranchers, and anyone needing a robust pickup for demanding tasks.
Technical Specifications
| Brand | GMC |
| Model | Sierra 2500HD |
| Generation | Sierra 2500HD IV (GMTK2XX) Regular Cab Long Box |
| Type (Engine) | 6.0 V8 (360 Hp) 4WD 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 | 7.6 kg/Hp, 130.9 Hp/tonne |
| Weight-to-torque ratio | 5.3 kg/Nm, 187.2 Nm/tonne |
| Power | 360 Hp @ 5400 rpm |
| Power per litre | 60.4 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 | 5965 cm3, 364.01 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 | 2751 kg, 6064.92 lbs. |
| Max. weight | 4309 kg, 9499.72 lbs. |
| Max load | 1558 kg, 3434.8 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%) | 6577 kg, 14499.8 lbs. |
| Length | 5699 mm, 224.37 in. |
| Width including mirrors | 2035 mm, 80.12 in. |
| Height | 1975 mm, 77.76 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) | 231 mm, 9.09 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, 350×40 mm |
| Rear brakes | Ventilated discs, 360×34 mm |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Cone worm with recirculation balls |
| Tires size | 245/75 R17; 265/70 R17; 265/70 R18; 265/60 R20 |
| Wheel rims size | 7.5J x 17; 8J x 18; 8J x 20 |
Powertrain & Engine Architecture
At the heart of this Sierra 2500HD variant lies the Vortec L96 6.0-liter V8 engine. This engine, a member of GM’s Vortec family, is a cast-iron block, aluminum-head design known for its durability and relatively simple architecture. It utilizes a traditional overhead valve (OHV) valvetrain with variable valve timing (VVT) to optimize performance and efficiency. Fuel delivery is managed by a multi-port fuel injection system. The L96 produces 360 horsepower at 5400 rpm and 515 lb-ft of torque at 4200 rpm, making it well-suited for heavy-duty applications. The engine is longitudinally mounted in the chassis.
The transmission paired with the L96 is the Hydra-Matic 6L90 six-speed automatic. This transmission is known for its robustness and ability to handle high torque loads. It features electronically controlled shifting and multiple shift schedules to optimize performance for various driving conditions. The 6L90’s gear ratios are tuned for towing and hauling, providing ample low-end torque for getting heavy loads moving.
Driving Characteristics
The 6.0L V8 and 6L90 automatic combination in the Sierra 2500HD delivers a capable, if not particularly sporty, driving experience. Acceleration is adequate for everyday driving, but the truck’s weight is noticeable. The automatic transmission shifts smoothly and provides sufficient power for towing and hauling. Compared to the available diesel engines, the 6.0L V8 offers less torque, resulting in slightly slower acceleration when heavily loaded. However, it provides a quieter and smoother driving experience than the diesel. The automatic transmission, while capable, doesn’t offer the same level of control as a manual transmission, and some drivers may find the shift points less responsive.
Equipment & Trim Levels
The Regular Cab Long Box 6.0L 4WD configuration typically served as the base model for the Sierra 2500HD. Standard equipment generally included air conditioning, power windows and locks, a basic audio system, and vinyl upholstery. Optional extras included upgraded audio systems, power seats, a trailer brake controller, and various appearance packages. The interior was functional and durable, prioritizing practicality over luxury. The Regular Cab configuration offered limited passenger space, making it best suited for work-focused applications.
Chassis & Braking
The Sierra 2500HD features a robust chassis designed to withstand heavy loads. The front suspension utilizes coil springs and a double wishbone setup with a transverse stabilizer bar. The rear suspension employs a traditional leaf spring design. This configuration provides a comfortable ride while maintaining excellent load-carrying capacity. Braking duties are handled by ventilated discs at all four corners, providing ample stopping power. An Anti-lock Braking System (ABS) is standard. The truck’s heavy weight necessitates a robust braking system to ensure safe and controlled stops, even when towing.
Market Reception & Comparison
The 6.0L V8-powered Sierra 2500HD was generally well-received by critics and consumers alike. It offered a compelling combination of capability, affordability, and reliability. Compared to the Duramax diesel engine option, the 6.0L V8 was less expensive to purchase and maintain, but it offered less towing capacity and fuel efficiency. The gasoline engine was often favored by buyers who didn’t require the extreme towing capabilities of the diesel and preferred a simpler, less complex powertrain. Fuel economy was typical for a heavy-duty truck, averaging around 14-16 mpg in combined driving.
Legacy
The Vortec L96 6.0L V8 and 6L90 automatic transmission combination proved to be a durable and reliable powertrain. While not as fuel-efficient as newer engine technologies, these components have a reputation for longevity and relatively low maintenance costs. In the used car market, Sierra 2500HDs equipped with this powertrain remain popular choices for buyers seeking a capable and affordable heavy-duty truck. Regular maintenance, including oil changes and transmission fluid flushes, is crucial for ensuring the long-term reliability of this powertrain. The simplicity of the design also makes it relatively easy to diagnose and repair, contributing to its continued appeal.
