The GMC Sierra 2500HD IV (GMTK2XX) Double Cab Standard Box, equipped with the 6.0-liter V8 engine and automatic transmission, represents a significant iteration in GMC’s heavy-duty truck lineup. Produced from 2015 to 2019, this variant occupied a sweet spot for buyers needing substantial towing and hauling capability without opting for the diesel-powered models. It was positioned as a robust work truck, appealing to those prioritizing gasoline power and a more accessible price point within the 2500HD range. This configuration blended proven Vortec engine technology with a comfortable, spacious double cab layout, making it suitable for both commercial and personal use.
Technical Specifications
| Brand | GMC |
| Model | Sierra 2500HD |
| Generation | Sierra 2500HD IV (GMTK2XX) Double Cab Standard Box |
| Type (Engine) | 6.0 V8 (360 Hp) 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 | 7.7 kg/Hp, 130.3 Hp/tonne |
| Weight-to-torque ratio | 5.4 kg/Nm, 186.4 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 | 2763 kg, 6091.37 lbs. |
| Max. weight | 4309 kg, 9499.72 lbs. |
| Max load | 1546 kg, 3408.35 lbs. |
| Trunk (boot) space – maximum | 1728 l, 61.02 cu. ft. |
| Fuel tank capacity | 136 l, 35.93 US gal | 29.92 UK gal |
| Permitted trailer load with brakes (12%) | 5897 kg, 13000.66 lbs. |
| Length | 5842 mm, 230 in. |
| Width including mirrors | 2045 mm, 80.51 in. |
| Height | 1984 mm, 78.11 in. |
| Wheelbase | 3662 mm, 144.17 in. |
| Front track | 1748 mm, 68.82 in. |
| Rear (Back) track | 1709 mm, 67.28 in. |
| Ride height (ground clearance) | 218 mm, 8.58 in. |
| Minimum turning circle (turning diameter) | 15 m, 49.21 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, 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 |
| Wheel rims size | 7.5J x 17; 8J x 18 |
Powertrain & Engine Architecture
At the heart of this Sierra 2500HD variant lies the Vortec L96 6.0-liter V8 engine. This engine, a staple of GM’s truck lineup for many years, is a cast-iron block, overhead valve (OHV) design. It utilizes a multi-port fuel injection system for precise fuel delivery and features 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. The Hydra-Matic 6L80E six-speed automatic transmission is paired with the L96, providing smooth and reliable shifting. This transmission is known for its durability and ability to handle the high torque output of the V8 engine. The gear ratios are tuned for towing and hauling, prioritizing low-end grunt over outright acceleration.
Driving Characteristics
The 6.0L V8 and 6-speed automatic combination delivers a capable, if not exhilarating, driving experience. While not as quick as the diesel options, the gasoline engine provides ample power for everyday driving and towing. The automatic transmission shifts smoothly, and the gear ratios are well-suited for hauling heavy loads. The truck feels planted and stable, even when fully loaded. Compared to the 6.6L Duramax diesel, the 6.0L lacks the sheer pulling power and fuel efficiency, but it offers a quieter and smoother ride. Against the smaller 5.3L V8, the 6.0L provides a noticeable increase in power and torque, making it a better choice for those who frequently tow or haul heavy items. The weight distribution is generally good, contributing to predictable handling.
Equipment & Trim Levels
The Double Cab Standard Box configuration offered a good balance of passenger space and bed length. Standard equipment 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 trailer brake controller, a rearview camera, and various appearance packages. The interior design was functional and durable, prioritizing practicality over luxury. The Double Cab provided comfortable seating for five passengers, making it suitable for families or work crews.
Chassis & Braking
The Sierra 2500HD IV utilizes a body-on-frame construction, providing a robust and durable platform. The front suspension consists of coil springs and a double wishbone setup, while the rear suspension employs a traditional leaf spring design. This configuration is optimized for load-carrying capacity and stability. The braking system features ventilated discs on all four wheels, providing adequate stopping power. Anti-lock brakes (ABS) were standard equipment. The truck’s heavy weight necessitates a robust braking system to ensure safe and controlled stops, especially when towing. Stabilizer bars were included to reduce body roll during cornering.
Market Reception & Comparison
The 6.0L V8-powered Sierra 2500HD received generally positive reviews. Critics praised its strong towing capacity, comfortable ride, and spacious interior. However, some noted that its fuel economy was lower than that of the diesel models. Compared to the Duramax diesel, the 6.0L offered a lower initial cost and simpler maintenance. The 6.0L also proved to be more reliable than earlier iterations of the Duramax, avoiding some of the diesel engine’s common issues. In terms of fuel economy, the 6.0L typically achieved around 14-16 mpg in combined driving, while the diesel could achieve upwards of 18-20 mpg.
Legacy
The Vortec L96 6.0L V8 has proven to be a durable and reliable engine, and the 2500HD models equipped with this powertrain continue to be popular on the used car market. While not as fuel-efficient as newer engines, the L96 offers a good balance of power, reliability, and affordability. Regular maintenance, including oil changes and tune-ups, is essential to ensure long-term reliability. These trucks are often sought after by those who need a capable work truck without the complexity and cost of a diesel engine. The GMTK2XX platform itself is known for its durability and longevity, making these Sierra 2500HDs a solid choice for buyers seeking a dependable heavy-duty truck.
