The Chevrolet Silverado 2500 HD IV (T1XX) Crew Cab Standard Bed, equipped with the 6.6-liter Duramax V8 engine and automatic transmission, represents a significant iteration in Chevrolet’s heavy-duty truck lineage. Produced from 2020 to 2023, this variant occupied a premium position within the fourth generation (T1XX) Silverado HD lineup, targeting buyers requiring substantial towing and hauling capabilities alongside a degree of comfort and refinement. It was a key offering in the North American full-size heavy-duty pickup truck market, competing directly with Ford’s Super Duty and Ram’s HD series.
Technical Specifications
| Brand | Chevrolet |
| Model | Silverado 2500 HD |
| Generation | Silverado 2500 HD IV (T1XX) Crew Cab Standard Bed |
| Type (Engine) | 6.6 Duramax V8 (445 Hp) Automatic |
| Start of production | 2020 |
| End of production | 2023 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 5 |
| Doors | 4 |
| Fuel Type | Diesel |
| Weight-to-power ratio | 7.6 kg/Hp, 132 Hp/tonne |
| Weight-to-torque ratio | 2.7 kg/Nm, 366.2 Nm/tonne |
| Power | 445 Hp @ 2800 rpm |
| Power per litre | 67.4 Hp/l |
| Torque | 1234 Nm @ 1600 rpm (910.15 lb.-ft. @ 1600 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | Duramax L5P |
| Engine displacement | 6604 cm3 (403 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 103 mm (4.06 in.) |
| Piston Stroke | 99 mm (3.9 in.) |
| Compression ratio | 16:1 |
| Number of valves per cylinder | 4 |
| Fuel injection system | Diesel Commonrail |
| Engine aspiration | Turbocharger, Intercooler |
| Valvetrain | OHV |
| Engine oil capacity | 9.5 l (10.04 US qt | 8.36 UK qt) |
| Coolant | 29.1 l (30.75 US qt | 25.6 UK qt) |
| Kerb Weight | 3370 kg (7429.58 lbs.) |
| Max. weight | 4899 kg (10800.45 lbs.) |
| Max load | 1529 kg (3370.87 lbs.) |
| Trunk (boot) space – maximum | 1968 l (69.5 cu. ft.) |
| Fuel tank capacity | 136 l (35.93 US gal | 29.92 UK gal) |
| Permitted trailer load with brakes (12%) | 8392 kg (18501.19 lbs.) |
| Length | 6349 mm (249.96 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 | Rear wheel drive. Internal Combustion engine (ICE) drives the rear wheels. |
| 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 |
| Tires size | 245/75 R17; 265/70 R17; 275/70 R18 |
| Wheel rims size | 7.5J x 17; 8J x 18 |
INTRODUCTION
The 2020-2023 Chevrolet Silverado 2500 HD Crew Cab with the 6.6L Duramax diesel and 10-speed Allison automatic transmission represented a significant upgrade over previous generations. Built on the T1XX platform, this truck aimed to deliver increased strength, capability, and refinement. The Crew Cab configuration offered spacious seating for five passengers, making it suitable for both work and family use. This particular variant was positioned as a premium offering, bridging the gap between the base gasoline engine options and the even more powerful, often more expensive, trims.
Powertrain & Engine Architecture
At the heart of this Silverado 2500 HD lies the Duramax L5P 6.6-liter V8 diesel engine. This engine is a turbocharged, overhead valve (OHV) design featuring direct injection and a robust cast iron block. The L5P utilizes a common-rail fuel injection system, delivering highly pressurized fuel directly into the cylinders for optimized combustion. The turbocharger, coupled with an intercooler, provides increased air density for enhanced power output. The engine produces 445 horsepower at 2800 rpm and a massive 910 lb-ft (1234 Nm) of torque at 1600 rpm. This torque figure is crucial for heavy towing and hauling. Paired with the engine is the Allison 10-speed automatic transmission, a heavy-duty unit designed to handle the engine’s substantial output. This transmission features electronically controlled shifts and a wide gear ratio spread for optimal performance and efficiency.
Driving Characteristics
The combination of the Duramax diesel and the 10-speed Allison transmission delivers a unique driving experience. While not as quick off the line as gasoline-powered trucks, the Silverado 2500 HD excels in situations requiring substantial low-end torque. The 10-speed transmission allows the engine to remain in its optimal power band, providing strong acceleration even when towing heavy loads. The gear ratios are well-spaced, contributing to smooth and confident highway cruising. Compared to the 6.0L gasoline V8, the Duramax offers significantly more torque, making it the preferred choice for those who regularly tow or haul. Compared to higher-output Duramax variants, this 445hp version provides a balance between power and fuel economy, making it a practical choice for everyday use.
Equipment & Trim Levels
The Silverado 2500 HD Crew Cab with the Duramax engine typically came standard with a comprehensive suite of features. These included air conditioning, power windows and locks, a touchscreen infotainment system with Apple CarPlay and Android Auto compatibility, and a rearview camera. Higher trim levels, such as LTZ 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 power sunroof, a navigation system, and a bed liner.
Chassis & Braking
The Silverado 2500 HD features a robust chassis designed to withstand heavy loads. 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. ABS (Anti-lock Braking System) is standard. The truck’s heavy-duty construction and well-tuned suspension contribute to its stability and control, even when towing at maximum capacity.
Market Reception & Comparison
The Silverado 2500 HD with the Duramax diesel received generally positive reviews from automotive critics. The engine was praised for its abundant torque and smooth operation, while the 10-speed Allison transmission was lauded for its responsiveness and efficiency. Fuel economy, while not exceptional, was considered reasonable for a heavy-duty truck of this size. Compared to the gasoline-powered Silverado 2500 HD, the Duramax variant offered superior towing and hauling capabilities, albeit at a higher initial cost. Reliability reports have been generally favorable, with the Duramax engine proving to be a durable and long-lasting powerplant.
Legacy
The 2020-2023 Chevrolet Silverado 2500 HD with the 6.6L Duramax and Allison transmission continues to hold its value in the used car market. The Duramax engine is known for its longevity and relatively low maintenance costs, making these trucks a desirable option for buyers seeking a capable and reliable heavy-duty pickup. The combination of power, capability, and comfort has cemented this variant’s reputation as a workhorse that can also provide a comfortable driving experience. These trucks are expected to remain popular choices for years to come, particularly among those who require a robust and dependable vehicle for demanding tasks.
