The GMC Sierra 2500HD V (GMTT1XX, facelift 2024) Crew Cab Standard Bed, equipped with the 6.6-liter V8 engine producing 401 horsepower and paired with a 4WD automatic transmission, represents GMC’s offering in the heavy-duty pickup truck segment. Introduced with the GMTT1XX platform refresh in 2023, this variant builds upon the established Sierra 2500HD lineage, aiming to provide a balance of robust capability, towing capacity, and everyday usability. This particular configuration positions itself as a strong contender for buyers needing substantial power and four-wheel drive, while prioritizing a comfortable cabin experience with the Crew Cab layout. It sits within the Sierra 2500HD lineup alongside trims offering different engine options, bed lengths, and feature packages.
Technical Specifications
| Brand | GMC |
| Model | Sierra 2500HD |
| Generation | Sierra 2500HD V (GMTT1XX, facelift 2024) Crew Cab Standard Bed |
| Type (Engine) | 6.6 V8 (401 Hp) 4WD Automatic |
| Start of production | 2023 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 5 |
| Doors | 4 |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 7.9 kg/Hp, 126.2 Hp/tonne |
| Weight-to-torque ratio | 5.1 kg/Nm, 197.9 Nm/tonne |
| Power | 401 Hp @ 5200 rpm |
| Torque | 629 Nm @ 4000 rpm, 463.93 lb.-ft. @ 4000 rpm |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | L8T |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 103.25 mm (4.06 in) |
| Piston Stroke | 98 mm (3.86 in) |
| Compression ratio | 10.8:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Direct injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | OHV |
| Engine oil capacity | 7.6 l (8.03 US qt | 6.69 UK qt) |
| Coolant | 14.6 l (15.43 US qt | 12.85 UK qt) |
| Kerb Weight | 3178 kg (7006.29 lbs) |
| Max. weight | 4740 kg (10449.91 lbs) |
| Max load | 1562 kg (3443.62 lbs) |
| Fuel tank capacity | 136 l (35.93 US gal | 29.92 UK gal) |
| Permitted trailer load with brakes (12%) | 7257 kg (15998.95 lbs) |
| Length | 6369 mm (250.75 in) |
| Width including mirrors | 2079 mm (81.85 in) |
| Height | 2027 mm (79.8 in) |
| Wheelbase | 4037 mm (158.94 in) |
| Front track | 1731 mm (68.15 in) |
| Rear (Back) track | 1736 mm (68.35 in) |
| Ride height (ground clearance) | 257 mm (10.12 in) |
| 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 | 10 gears, automatic transmission Allison |
| Front suspension | Independent torsion bar, double wishbone |
| Rear suspension | Rigid axle suspension, Leaf spring |
| Front brakes | Ventilated discs, 355×40 mm |
| Rear brakes | Ventilated discs, 360×34 mm |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Cone worm with recirculation balls |
| Power steering | Hydraulic Steering |
| Tires size | 245/75 R17; 265/70 R17; 275/70 R18; 275/65 R20 |
| Wheel rims size | 7.5J x 17; 8J x 18; 8.5J x 20 |
Introduction
The 2024 GMC Sierra 2500HD Crew Cab Standard Bed with the 6.6L V8 and 4WD automatic transmission is a heavy-duty pickup truck designed for demanding tasks. As part of the GMTT1XX generation, which received a significant facelift for the 2024 model year, it represents GMC’s commitment to providing a powerful and capable work truck with enhanced comfort and technology. The Crew Cab configuration offers spacious seating for five passengers, making it suitable for both work and family use. This variant is positioned as a versatile option within the Sierra 2500HD range, appealing to customers who require substantial towing and payload capacity without sacrificing interior space or everyday drivability.
Powertrain & Engine Architecture
At the heart of this Sierra 2500HD is the 6.6-liter L8T V8 gasoline engine. This engine utilizes direct injection technology to optimize fuel delivery and combustion efficiency. The engine features an overhead valve (OHV) valvetrain, a design choice often favored for its durability and low-end torque characteristics. The 10-speed Allison automatic transmission is a key component of this powertrain, providing smooth and efficient gear changes. This transmission is known for its robustness and ability to handle the high torque output of the V8 engine. The transmission’s gear ratios are optimized for both towing and everyday driving, offering a balance between power and fuel economy. The engine produces 401 horsepower at 5200 rpm and 629 Nm (463.93 lb.-ft.) of torque at 4000 rpm, providing ample power for hauling heavy loads and navigating challenging terrain.
Driving Characteristics
The 6.6L V8 and 10-speed automatic combination delivers a robust driving experience. While not as quick as some lighter-duty pickups, the Sierra 2500HD offers substantial low-end torque, making it capable of accelerating confidently even when heavily loaded. The 10-speed transmission helps keep the engine in its optimal power band, providing responsive acceleration and smooth shifting. Compared to the available Duramax diesel engine, this gasoline V8 offers a different driving character. The diesel provides superior towing capacity and fuel economy, but the gasoline engine offers a more familiar sound and feel for many drivers. The 4WD system provides excellent traction in various conditions, enhancing stability and control on slippery surfaces. The ride quality, while firm due to the heavy-duty suspension, is reasonably comfortable for a truck of this size and capability.
Equipment & Trim Levels
The Sierra 2500HD Crew Cab Standard Bed 6.6L V8 4WD typically comes standard with a comprehensive suite of features. These include air conditioning, power windows and locks, a touchscreen infotainment system with Apple CarPlay and Android Auto compatibility, and a rearview camera. Higher trim levels add features such as leather upholstery, heated and ventilated front seats, a premium sound system, and advanced safety technologies like blind-spot monitoring and rear cross-traffic alert. Optional extras often include a power sunroof, a navigation system, and a trailering package with features like trailer brake control and a trailer guidance system. The interior design emphasizes functionality and durability, with comfortable seating and intuitive controls.
Chassis & Braking
The Sierra 2500HD utilizes a robust chassis designed to withstand heavy loads and demanding conditions. The front suspension features an independent torsion bar setup with double wishbones, providing a comfortable ride and precise handling. The rear suspension employs a rigid axle with leaf springs, offering excellent load-carrying capacity. The braking system consists of ventilated discs on all four wheels, with larger rotors at the front (355×40 mm) compared to the rear (360×34 mm). An Anti-lock Braking System (ABS) is standard, enhancing safety and control during emergency braking situations. The steering system utilizes a cone worm with recirculation balls, providing precise and responsive steering feel.
Market Reception & Comparison
The GMC Sierra 2500HD with the 6.6L V8 has generally received positive reviews for its powerful engine, capable towing capacity, and comfortable interior. Critics have noted that the gasoline V8 offers a more affordable entry point into the heavy-duty truck segment compared to the diesel option. However, the diesel engine typically offers superior fuel economy and towing capacity. Compared to competitors like the Ford Super Duty and Ram 2500, the Sierra 2500HD is often praised for its refined interior and user-friendly technology. Fuel economy is a typical concern for this class of vehicle, and the 6.6L V8 is not the most fuel-efficient option, but it provides a good balance of power and usability.
Legacy
The 6.6L V8 engine has been a mainstay in GMC’s heavy-duty truck lineup for many years, known for its reliability and durability. While the diesel engine often receives more attention, the gasoline V8 remains a popular choice for buyers who prioritize affordability and a familiar driving experience. The GMTT1XX platform, with its 2024 facelift, represents a continued commitment to improving the Sierra 2500HD’s capabilities and features. In the used car market, these trucks generally hold their value well, particularly those that have been well-maintained and have a documented service history. The Allison 10-speed automatic transmission is also highly regarded for its longevity and performance, contributing to the overall reliability of this powertrain.
