The GMC Sierra 3500HD, in its fifth generation (GMTT1XX), received a significant facelift for the 2024 model year. This iteration continues GMC’s tradition of offering a robust and capable heavy-duty pickup truck aimed at demanding tasks like towing and hauling. The Crew Cab Long Bed configuration, paired with the 6.6-liter V8 gasoline engine producing 401 horsepower, represents a popular choice for buyers seeking a balance of power, space, and usability. This specific variant occupies a strong position in the lineup, offering substantial capability without the higher price point of the Duramax diesel options.
Technical Specifications
| Brand | GMC |
| Model | Sierra 3500HD |
| Generation | Sierra 3500HD V (GMTT1XX, facelift 2024) Crew Cab Long Bed |
| Type (Engine) | 6.6 V8 (401 Hp) SRW 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 | 7.8 kg/Hp, 128.4 Hp/tonne |
| Weight-to-torque ratio | 5 kg/Nm, 201.5 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 | 3122 kg (6882.83 lbs) |
| Max. weight | 5148 kg (11349.4 lbs) |
| Max load | 2026 kg (4466.57 lbs) |
| Fuel tank capacity | 136 l (35.93 US gal | 29.92 UK gal) |
| Permitted trailer load with brakes (12%) | 7257 kg (15998.95 lbs) |
| Length | 6776 mm (266.77 in) |
| Width including mirrors | 2079 mm (81.85 in) |
| Height | 2049 mm (80.67 in) |
| Wheelbase | 4369 mm (172.01 in) |
| Front track | 1731 mm (68.15 in) |
| Rear (Back) track | 1736 mm (68.35 in) |
| Ride height (ground clearance) | 283 mm (11.14 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 | 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 |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Cone worm with recirculation balls |
| Power steering | Hydraulic Steering |
| Tires size | 275/70 R18; 275/65 R20 |
| Wheel rims size | 8J x 18; 8.5J x 20 |
Powertrain & Engine Architecture
The heart of this Sierra 3500HD is the 6.6-liter L8T V8 gasoline engine. This engine is a naturally aspirated, overhead valve (OHV) design featuring direct fuel injection. The direct injection system allows for precise fuel delivery, contributing to improved efficiency and power output. The engine produces 401 horsepower at 5200 rpm and 464 lb-ft of torque at 4000 rpm. The engine’s robust construction is designed for heavy-duty applications, prioritizing durability and longevity. The engine is mated to a 10-speed Allison automatic transmission, a hallmark of GMC’s heavy-duty trucks. This transmission is known for its smooth shifting and ability to handle significant torque loads. The Allison transmission is electronically controlled, optimizing shift points for both performance and fuel economy.
Driving Characteristics
The 6.6L V8 and 10-speed automatic combination delivers a confident driving experience. While not as fuel-efficient as the diesel options, the gasoline engine provides ample power for everyday driving and demanding tasks. The 10-speed transmission keeps the engine in its optimal power band, providing strong acceleration and responsive performance. Compared to the 6.6L Duramax diesel, this configuration offers a smoother, quieter ride, but sacrifices towing capacity and fuel economy. The gear ratios are well-suited for both on-road cruising and off-road conditions, providing a balance of power and control. The rear-wheel-drive configuration provides a traditional truck feel, while available four-wheel-drive systems enhance traction in challenging conditions.
Equipment & Trim Levels
The 2024 Sierra 3500HD Crew Cab Long Bed with the 6.6L V8 typically comes standard with a comprehensive suite of features. These include a user-friendly infotainment system with a large touchscreen display, Apple CarPlay and Android Auto compatibility, and a premium sound system. Interior appointments generally include cloth upholstery, though leather options are available on higher trim levels. Standard safety features include ABS, stability control, and multiple airbags. Optional extras often include a power sunroof, heated and ventilated front seats, a rear-seat entertainment system, and advanced driver-assistance systems like adaptive cruise control and lane departure warning.
Chassis & Braking
The Sierra 3500HD features a robust chassis designed to withstand heavy loads and demanding conditions. 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 load-carrying capacity. Braking duties are handled by ventilated disc brakes on all four wheels, providing ample stopping power. The front brakes measure 355x40mm, while the rear brakes are 360x34mm. An Anti-lock Braking System (ABS) is standard, enhancing safety and control during emergency braking situations.
Market Reception & Comparison
Critics generally praised the 2024 Sierra 3500HD for its powerful engine, comfortable ride, and advanced technology. The 6.6L V8 was noted for its smooth operation and ample power, making it a suitable choice for buyers who don’t require the ultimate towing capacity of the diesel engine. Fuel economy, however, was a common criticism, as the gasoline engine lags behind the diesel in terms of miles per gallon. Compared to the Duramax diesel, the V8 offers a lower initial cost and simpler maintenance requirements. The Ford Super Duty and Ram 3500 represent the primary competitors in this segment, each offering its own strengths and weaknesses.
Legacy
The 6.6L V8 engine has a long-standing reputation for reliability and durability in GMC and Chevrolet trucks. While the Allison transmission is known for its longevity, regular maintenance is crucial to ensure its continued performance. In the used car market, Sierra 3500HD models equipped with this powertrain generally hold their value well, particularly those that have been well-maintained and used for moderate-duty tasks. The combination of power, capability, and relative simplicity makes this variant a popular choice among truck enthusiasts and those seeking a dependable heavy-duty pickup.
