Technical Specifications
| Brand | GMC |
| Model | Sierra 2500HD |
| Generation | Sierra 2500HD V (GMTT1XX) Regular Cab Long Bed |
| Type (Engine) | 6.6 V8 (401 Hp) 4WD Automatic |
| Start of production | 2020 |
| End of production | 2023 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 2 |
| Doors | 2 |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 7.3 kg/Hp, 137.8 Hp/tonne |
| Weight-to-torque ratio | 4.6 kg/Nm, 216.1 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, VVT |
| 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 | 2911 kg (6417.66 lbs.) |
| Max. weight | 4649 kg (10249.29 lbs.) |
| Max load | 1738 kg (3831.63 lbs.) |
| 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 | 5982 mm (235.51 in.) |
| Width including mirrors | 2076 mm (81.73 in.) |
| Height | 2030 mm (79.92 in.) |
| Wheelbase | 3595 mm (141.54 in.) |
| Front track | 1731 mm (68.15 in.) |
| Rear (Back) track | 1736 mm (68.35 in.) |
| Ride height (ground clearance) | 259 mm (10.2 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 | 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, 360×34 mm |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Cone worm with recirculation balls |
| Power steering | Hydraulic Steering |
| Tires size | 235/80 R17; 265/70 R17; 245/75 R17; 275/70 R18 |
| Wheel rims size | 7.5J x 17; 8J x 18 |
The GMC Sierra 2500HD, particularly in its Regular Cab Long Bed configuration with the 6.6L V8 and 4WD automatic, is a work-focused truck designed for demanding tasks. Introduced as part of the GMTT1XX generation in 2020, it represented a significant update to GMC’s heavy-duty lineup. This variant aimed to provide a balance between capability, affordability, and usability for customers who prioritized functionality over luxury. It served as a robust option for those needing a powerful truck for towing, hauling, and general work purposes, fitting neatly between the base model and the more upscale trims.
Powertrain & Engine Architecture
At the heart of this Sierra 2500HD lies the 6.6-liter L8T V8 gasoline engine. This engine is a naturally aspirated, overhead valve (OHV) design featuring direct fuel injection and variable valve timing (VVT). The direct injection system optimizes combustion efficiency and power delivery. The OHV configuration, while less common in modern engines, contributes to the engine’s durability and low-end torque. The engine produces 401 horsepower at 5200 rpm and 629 lb-ft of torque at 4000 rpm. This torque output is crucial for heavy-duty applications. The engine’s robust construction and relatively simple design contribute to its reliability.
The engine is mated to a six-speed Hydra-Matic automatic transmission. This transmission is known for its durability and ability to handle the high torque output of the 6.6L V8. The transmission’s gear ratios are optimized for both towing and everyday driving, providing a balance between power and fuel efficiency. 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 6.6L V8 and six-speed automatic combination delivers a strong and confident driving experience. While not as quick as some of the lighter-duty pickups, the Sierra 2500HD provides ample power for accelerating with a load or tackling steep grades. The automatic transmission shifts smoothly and predictably, and the gear ratios are well-suited for both highway cruising and low-speed towing. The truck’s substantial weight and heavy-duty suspension contribute to a firm ride, but it effectively absorbs bumps and provides a stable platform for hauling heavy loads. Compared to the available diesel engine options, this gasoline V8 offers a more responsive feel and a simpler maintenance profile, though it typically delivers lower fuel economy.
Equipment & Trim Levels
The Regular Cab Long Bed 6.6L V8 4WD configuration typically served as a work-oriented trim. Standard features generally included air conditioning, a basic infotainment system with a touchscreen display, and vinyl upholstery. Optional extras could include upgraded infotainment systems with navigation, power windows and locks, keyless entry, and a trailer brake controller. The interior was functional and durable, designed to withstand the rigors of daily work use. The long bed provided ample cargo space, making it ideal for hauling building materials, equipment, or other large items.
Chassis & Braking
The Sierra 2500HD 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 good balance between ride comfort and load-carrying capacity. The braking system consists of ventilated discs at all four wheels, providing ample stopping power even when towing. ABS (Anti-lock Braking System) is standard, enhancing safety and control. The truck’s steering system is a hydraulic power steering setup, offering a responsive and precise feel.
Market Reception & Comparison
The GMC Sierra 2500HD with the 6.6L V8 and automatic transmission was generally well-received by critics and consumers. It was praised for its strong towing and hauling capabilities, its durable construction, and its relatively affordable price point. Compared to the diesel-powered versions, the gasoline V8 offered a lower initial cost and simpler maintenance, but it typically delivered lower fuel economy. Against competitors like the Ford F-250 and Ram 2500, the Sierra 2500HD held its own, offering a compelling combination of capability, value, and reliability.
Legacy
The 6.6L L8T V8 engine and the six-speed Hydra-Matic transmission have proven to be relatively reliable powertrains. While regular maintenance is essential, these components are generally known for their durability. In the used car market, the 2020-2023 GMC Sierra 2500HD with this powertrain configuration remains a popular choice for buyers seeking a capable and affordable heavy-duty pickup truck. Its strong towing capacity, durable construction, and relatively simple maintenance requirements make it a practical and dependable option for a wide range of applications. The availability of parts and service is also good, ensuring that these trucks can be kept on the road for many years to come.
