The Chevrolet Silverado 3500 HD IV (T1XX) Double Cab Long Bed, equipped with the 6.6-liter V8 engine producing 401 horsepower and paired with a six-speed automatic transmission, represents a significant iteration in Chevrolet’s heavy-duty truck lineage. Produced from 2020 through 2023, this variant occupied a sweet spot in the Silverado 3500HD lineup, offering a balance of capability, comfort, and technology aimed at buyers needing serious towing and hauling capacity without the expense of the top-tier trims. It was part of the fourth generation (T1XX) of the Silverado HD series, known for its increased strength and refinement over its predecessors.
Technical Specifications
| Brand | Chevrolet |
| Model | Silverado 3500 HD |
| Generation | Silverado 3500 HD IV (T1XX) Double Cab Long Bed |
| Type (Engine) | 6.6 V8 (401 Hp) SRW Automatic |
| Start of production | 2020 |
| End of production | 2023 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 5 |
| Doors | 4 |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 7.6 kg/Hp, 132.2 Hp/tonne |
| Weight-to-torque ratio | 4.8 kg/Nm, 207.3 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 | 3034 kg / 6688.83 lbs |
| Max. weight | 5035 kg / 11100.27 lbs |
| Max load | 2001 kg / 4411.45 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%) | 7575 kg / 16700.02 lbs |
| Length | 6514 mm / 256.46 in |
| Width including mirrors | 2079 mm / 81.85 in |
| Height | 2054 mm / 80.87 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) | 284 mm / 11.18 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 | Disc, 355×40 mm |
| Rear brakes | Disc, 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 |
INTRODUCTION
The 2020-2023 Chevrolet Silverado 3500 HD Double Cab Long Bed with the 6.6L V8 and automatic transmission was positioned as a workhorse for owners who frequently tow large trailers, haul heavy payloads, or require a robust truck for demanding tasks. It sat comfortably between the base model 6.6L Duramax diesel and the higher-trim levels offering more luxury features. The T1XX platform, introduced with this generation, provided a stiffer frame and improved suspension geometry, enhancing both towing capacity and ride quality. This configuration was particularly popular in regions where gasoline engines are preferred for their lower initial cost and simpler maintenance compared to diesel alternatives.
Powertrain & Engine Architecture
At the heart of this Silverado 3500 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. It features direct fuel injection, a variable valve timing (VVT) system, and an overhead valve (OHV) valvetrain. The direct injection system optimizes combustion efficiency and power delivery, 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.
The engine is mated to a six-speed Hydra-Matic automatic transmission. This transmission is designed to handle the high torque output of the V8 engine and provide smooth, reliable shifting under heavy loads. The gear ratios are optimized for towing and hauling, with a relatively low first gear for quick acceleration from a standstill and a high sixth gear for efficient highway cruising. The transmission also features a tow/haul mode, which alters shift points to maximize engine braking and reduce transmission heat when towing.
Driving Characteristics
The Silverado 3500 HD 6.6L V8 Automatic delivers a driving experience focused on capability and stability. While not as quick as some of the lighter-duty trucks or those equipped with the diesel engine, it provides ample power for most towing and hauling scenarios. The automatic transmission shifts smoothly and predictably, and the tow/haul mode is effective in managing engine braking on downhill grades. The long wheelbase and heavy-duty suspension contribute to a comfortable ride, even when the truck is unloaded. However, the truck’s size and weight are noticeable in tight maneuvering situations. Compared to the diesel variant, the gasoline engine is quieter and offers quicker throttle response, but it lacks the diesel’s superior low-end torque and fuel efficiency.
Equipment & Trim Levels
The Silverado 3500 HD Double Cab Long Bed 6.6L V8 Automatic typically came standard with features such as 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, a navigation system, and a bed liner. The Double Cab configuration offered a spacious rear seat, making it suitable for carrying passengers in addition to cargo.
Chassis & Braking
The Silverado 3500 HD features a fully boxed, high-strength steel frame designed to withstand the stresses of heavy-duty use. The front suspension consists of an independent torsion bar setup with double wishbone control arms, while the rear suspension utilizes a rigid axle with leaf springs. This combination provides a good balance of ride comfort and load-carrying capacity. Braking duties are handled by disc brakes on all four wheels, with larger rotors and calipers on the front axle. An anti-lock braking system (ABS) is standard. The steering system is a hydraulic rack-and-pinion setup, providing precise and responsive steering feel.
Market Reception & Comparison
The Silverado 3500 HD 6.6L V8 Automatic received generally positive reviews from automotive critics. It was praised for its strong towing capacity, comfortable ride, and user-friendly features. However, some critics noted that the gasoline engine’s fuel economy was not as competitive as the diesel engine’s. Compared to the Duramax diesel variant, the 6.6L V8 offered a lower purchase price and simpler maintenance requirements, making it an attractive option for buyers who did not require the diesel’s maximum towing capacity or fuel efficiency. Against competitors like the Ford Super Duty and Ram Heavy Duty, the Silverado 3500 HD offered a compelling combination of capability, comfort, and value.
Legacy
The L8T 6.6L V8 engine and the six-speed Hydra-Matic transmission have proven to be reliable and durable powertrains. While not as fuel-efficient as newer engine technologies, they remain a popular choice for owners who prioritize simplicity and dependability. In the used car market, the 2020-2023 Silverado 3500 HD 6.6L V8 Automatic holds its value well, particularly those models that have been well-maintained and have a documented service history. Its robust construction and proven track record make it a desirable option for buyers seeking a capable and reliable heavy-duty truck.
