The Chevrolet Silverado 3500 HD IV, specifically the Double Cab Long Bed configuration equipped with the 6.6-liter V8 engine producing 401 horsepower, represents the fourth generation of Chevrolet’s heavy-duty pickup truck line. Introduced with the 2024 facelift of the T1XX platform, this variant caters to buyers needing substantial towing and hauling capacity without sacrificing everyday usability. Positioned as a mid-to-upper tier offering within the Silverado 3500 HD range, it slots above the standard work truck trims and below the fully-loaded luxury models. This particular configuration, featuring a dual rear wheel (DRW) setup and an Allison automatic transmission, is geared towards professional tradespeople and those requiring maximum capability.
Technical Specifications
| Brand | Chevrolet |
| Model | Silverado 3500 HD |
| Generation | Silverado 3500 HD IV (T1XX, facelift 2024) Double Cab Long Bed |
| Type (Engine) | 6.6 V8 (401 Hp) DRW Automatic |
| Start of production | 2024 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 5 |
| Doors | 4 |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 8.1 kg/Hp, 123.8 Hp/tonne |
| Weight-to-torque ratio | 5.1 kg/Nm, 194.2 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 | 3239 kg (7140.77 lbs) |
| Max. weight | 6350 kg (13999.35 lbs) |
| Max load | 3111 kg (6858.58 lbs) |
| Fuel tank capacity | 136 l (35.93 US gal | 29.92 UK gal) |
| Permitted trailer load with brakes (12%) | 8323 kg (18349.07 lbs) |
| Length | 6514 mm (256.46 in) |
| Width including mirrors | 2457 mm (96.73 in) |
| Height | 2037 mm (80.2 in) |
| Wheelbase | 4127 mm (162.48 in) |
| Front track | 1731 mm (68.15 in) |
| Rear (Back) track | 1905 mm (75 in) |
| Ride height (ground clearance) | 264 mm (10.39 in) |
| Drivetrain Architecture | Rear wheel drive |
| 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, 355×40 mm |
| Tires size | 235/80 R17; 235/80 R18 |
| Wheel rims size | 6.5J x 17; 8J x 18 |
Powertrain & Engine Architecture
At the heart of this Silverado 3500 HD variant lies the Chevrolet L8T 6.6-liter V8 gasoline engine. This engine is a naturally aspirated, overhead valve (OHV) design featuring direct fuel injection. The L8T represents an evolution of the Duramax gasoline V8, offering increased power and torque compared to earlier iterations. The engine boasts a bore of 103.25 mm (4.06 inches) and a stroke of 98 mm (3.86 inches), resulting in a displacement of 6.6 liters. The 10.8:1 compression ratio contributes to its performance. Power is transmitted to the rear wheels via a robust 10-speed Allison automatic transmission, specifically tuned for heavy-duty applications. This transmission provides a wide gear ratio spread, optimizing both towing performance and fuel efficiency. The Allison transmission is known for its durability and smooth shifting characteristics.
Driving Characteristics
The 401 horsepower and 629 Nm (463.93 lb-ft) of torque delivered by the L8T engine, coupled with the 10-speed Allison transmission, provide substantial pulling power. While not as quick accelerating as lighter-duty pickups, this Silverado 3500 HD excels at hauling heavy loads. The DRW configuration significantly enhances stability when towing, distributing the weight more evenly across the rear axle. The transmission’s gear ratios are optimized for towing, allowing the engine to remain within its peak torque band even when climbing hills or navigating challenging terrain. Compared to the available Duramax diesel engine, the gasoline V8 offers a different driving experience. The diesel provides superior torque at lower RPMs, making it ideal for extremely heavy towing, while the gasoline engine offers a more responsive feel in everyday driving situations. The gasoline engine is also generally quieter and smoother than the diesel.
Equipment & Trim Levels
The Double Cab Long Bed 6.6L V8 DRW Silverado 3500 HD typically comes 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 add features like leather upholstery, heated and ventilated front seats, a premium sound system, and advanced safety technologies such as lane departure warning and automatic emergency braking. Optional extras include a power sunroof, a navigation system, and a bed liner. The interior design focuses on functionality and durability, with comfortable seating and easy-to-use controls.
Chassis & Braking
The Silverado 3500 HD features a fully boxed frame designed for strength and rigidity. The front suspension utilizes an independent torsion bar and double wishbone setup, providing a comfortable ride and precise handling. The rear suspension employs a traditional leaf spring design, optimized for heavy-duty load carrying. Ventilated disc brakes are used on all four wheels, providing ample stopping power even when heavily loaded. The braking system is assisted by ABS (Anti-lock Braking System) for enhanced safety. The DRW configuration necessitates a wider rear track, contributing to increased stability.
Market Reception & Comparison
The Silverado 3500 HD with the 6.6L V8 and Allison transmission has been generally well-received by critics and consumers alike. It offers a compelling alternative to diesel-powered trucks for those who don’t require the absolute maximum towing capacity. Fuel economy is a consideration, as the gasoline V8 is less fuel-efficient than the Duramax diesel, particularly when towing. However, the gasoline engine’s lower initial cost and simpler maintenance requirements can offset this disadvantage. Compared to competitors like the Ford Super Duty and Ram Heavy Duty, the Silverado 3500 HD offers a competitive combination of power, capability, and value.
Legacy
The L8T 6.6L V8 and Allison 10-speed automatic transmission combination has proven to be a reliable powertrain. While long-term durability data is still emerging due to the relatively recent introduction of the T1XX platform facelift, the Allison transmission has a long-standing reputation for robustness. On the used car market, these Silverado 3500 HD models are expected to hold their value well, particularly those that have been well-maintained and used primarily for personal transportation rather than extreme commercial applications. The DRW configuration adds to the resale value, as it appeals to a specific segment of buyers needing maximum towing capacity.
