The Chevrolet Silverado 2500 HD IV (T1XX) Double Cab Long Bed, equipped with the 6.6-liter V8 engine producing 401 horsepower and paired with a 6-speed automatic transmission, represents a significant offering in the heavy-duty pickup truck segment. Produced from 2020 through 2023, this configuration occupied a sweet spot in the Silverado 2500 HD lineup, balancing capability with a degree of refinement suitable for both work and personal use. It falls within the fourth generation of the Silverado HD series (T1XX platform), known for its increased strength, improved technology, and enhanced towing capacity compared to its predecessors.
Technical Specifications
| Brand | Chevrolet |
| Model | Silverado 2500 HD |
| Generation | Silverado 2500 HD IV (T1XX) Double Cab Long Bed |
| Type (Engine) | 6.6 V8 (401 Hp) Automatic |
| Start of production | 2020 year |
| End of production | 2023 year |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 5 |
| Doors | 4 |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 7.4 kg/Hp, 135.2 Hp/tonne |
| Weight-to-torque ratio | 4.7 kg/Nm, 212 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 | 15.1 l / 15.96 US qt | 13.29 UK qt |
| Kerb Weight | 2967 kg / 6541.12 lbs |
| Max. weight | 4627 kg / 10200.79 lbs |
| Max load | 1660 kg / 3659.67 lbs |
| Trunk (boot) space – maximum | 2364 l / 83.48 cu. ft |
| Fuel tank capacity | 136 l / 35.93 US gal | 29.92 UK gal |
| Permitted trailer load with brakes (12%) | 7679 kg / 16929.3 lbs |
| Length | 6514 mm / 256.46 in |
| Width including mirrors | 2079 mm / 81.85 in |
| Height | 2027 mm / 79.8 in |
| Wheelbase | 4127 mm / 162.48 in |
| Front track | 1731 mm / 68.15 in |
| Rear (Back) track | 1736 mm / 68.35 in |
| Ride height (ground clearance) | 258 mm / 10.16 in |
| 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 | 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 | 265/70 R17; 245/75 R17; 275/70 R18 |
| Wheel rims size | 7.5J x 17; 8J x 18 |
Powertrain & Engine Architecture
At the heart of this Silverado 2500 HD variant lies the Chevrolet L8T 6.6-liter naturally aspirated V8 engine. This engine is a member of the Vortec family, known for its robust construction and reliable performance. The L8T features direct fuel injection, a variable valve timing (VVT) system, and an overhead valve (OHV) configuration. Direct injection optimizes combustion efficiency and power output, while VVT enhances low-end torque and improves fuel economy. The engine produces 401 horsepower at 5200 rpm and 629 lb-ft of torque at 4000 rpm, making it well-suited for demanding tasks like towing and hauling. The Hydra-Matic 6L90 six-speed automatic transmission is the standard pairing for this engine. This transmission is known for its durability and smooth shifting characteristics, providing adequate gear ratios for both on-road driving and heavy-duty applications.
Driving Characteristics
The 6.6L V8 and 6-speed automatic combination delivers a confident and capable driving experience. While not as quick as some of the newer turbocharged diesel options, the L8T provides ample power for everyday driving and demanding workloads. The automatic transmission is well-tuned, offering smooth and predictable shifts. The gear ratios are optimized for towing, providing strong low-end torque. Compared to the available Duramax diesel engine, this gasoline V8 offers a more traditional driving feel and a lower initial purchase price, but sacrifices fuel economy and ultimate towing capacity. Compared to the 6.0L gasoline V8, the 6.6L offers a significant increase in both horsepower and torque.
Equipment & Trim Levels
The Silverado 2500 HD Double Cab Long Bed with the 6.6L V8 typically came standard with features like air conditioning, power windows and locks, a basic infotainment system with a touchscreen display, and a rearview camera. Higher trim levels, such as the LT and High Country, added features like leather upholstery, heated and ventilated front seats, a premium sound system, and advanced safety technologies like lane departure warning and automatic emergency braking. Optional extras included a sunroof, navigation system, and various towing packages.
Chassis & Braking
The Silverado 2500 HD features a fully boxed frame designed for strength and rigidity. The front suspension utilizes an independent torsion bar setup with double wishbones, providing a comfortable ride and good handling. The rear suspension employs a traditional leaf spring design, optimized for load-carrying capacity. Braking duties are handled by ventilated disc brakes on all four wheels, providing ample stopping power even when towing heavy loads. An anti-lock braking system (ABS) is standard. The steering system is a hydraulic rack-and-pinion setup, offering precise and responsive steering feel.
Market Reception & Comparison
The Silverado 2500 HD with the 6.6L V8 and 6-speed automatic was generally well-received by critics and consumers. It was praised for its strong engine, comfortable ride, and capable towing capacity. However, its fuel economy was often criticized, especially compared to the diesel options. In terms of reliability, the L8T engine has proven to be relatively dependable, although some owners have reported issues with the automatic transmission. Compared to the Ford Super Duty and Ram 2500, the Silverado 2500 HD offered a competitive combination of features, performance, and price.
Legacy
The Chevrolet Silverado 2500 HD IV (T1XX) Double Cab Long Bed 6.6 V8 Automatic remains a popular choice in the used truck market. The L8T engine is known for its longevity and relatively low maintenance costs. While newer trucks offer more advanced technology and improved fuel economy, this generation Silverado 2500 HD continues to provide a capable and reliable workhorse for those seeking a heavy-duty pickup truck. Its robust construction and proven powertrain ensure that it will remain a valuable asset for years to come.
