The GMC Sierra 1500 V (GMTT1XX) Double Cab, equipped with the 5.3-liter V8 engine producing 355 horsepower and paired with an automatic transmission, represents a significant iteration of GMC’s full-size pickup truck lineage. Produced from 2018 to 2021, this variant occupied a central position within the Sierra 1500 lineup, offering a balance between capability, comfort, and affordability. It was part of the fourth generation of the Sierra 1500, known internally as the GMTT1XX platform, which brought substantial improvements in technology, materials, and overall refinement compared to its predecessors.
Technical Specifications
| Brand | GMC |
| Model | Sierra 1500 |
| Generation | Sierra 1500 V (GMTT1XX) Double Cab |
| Type (Engine) | 5.3 V8 (355 Hp) Automatic |
| Start of production | 2018 |
| End of production | 2021 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 15.7 l/100 km (15 US mpg, 18 UK mpg, 6.4 km/l) |
| Fuel consumption (extra urban) | 11.2 l/100 km (21 US mpg, 25.2 UK mpg, 8.9 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 6 kg/Hp, 166.5 Hp/tonne |
| Weight-to-torque ratio | 4.1 kg/Nm, 243.4 Nm/tonne |
| Power | 355 Hp @ 5600 rpm |
| Power per litre | 66.6 Hp/l |
| Torque | 519 Nm @ 4100 rpm (382.79 lb.-ft. @ 4100 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | L82 |
| Engine displacement | 5328 cm3 (325.13 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 96 mm (3.78 in.) |
| Piston Stroke | 92 mm (3.62 in.) |
| Compression ratio | 11:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Direct injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | OHV, VVT DI |
| Coolant Capacity | 12.8 l (13.53 US qt | 11.26 UK qt) |
| Kerb Weight | 2132 kg (4700.26 lbs.) |
| Max. weight | 3130 kg (6900.47 lbs.) |
| Max load | 998 kg (2200.21 lbs.) |
| Fuel tank capacity | 91 l (24.04 US gal | 20.02 UK gal) |
| Permitted trailer load with brakes (12%) | 4400 kg (9700.34 lbs.) |
| Length | 5886 mm (231.73 in.) |
| Width including mirrors | 2063 mm (81.22 in.) |
| Height | 1921 mm (75.63 in.) |
| Wheelbase | 3745 mm (147.44 in.) |
| Drivetrain Architecture | Rear wheel drive |
| Number of gears and type of gearbox | 6 gears, automatic transmission |
| Front suspension | Independent coil spring |
| Rear suspension | Rigid axle suspension, Leaf spring |
| Front brakes | Ventilated discs, 330×30 mm |
| Rear brakes | Ventilated discs, 345×20 mm |
| Tires size | 255/70 R17; 265/70 R17; 265/65 R18 |
| Wheel rims size | 8.0J x 17; 8.5J x 18 |
Powertrain & Engine Architecture
At the heart of this Sierra 1500 variant lies the GM L82 5.3-liter V8 engine. This engine is a member of GM’s Small Block family, known for its durability and relatively simple design. The L82 utilizes direct fuel injection (DFI) and variable valve timing (VVT) to optimize both power and fuel efficiency. The DFI system delivers fuel directly into the combustion chamber, allowing for more precise fuel control and increased power output. The VVT system adjusts the timing of the intake and exhaust valves based on engine speed and load, further enhancing efficiency and responsiveness. The engine produces 355 horsepower at 5600 rpm and 383 lb-ft of torque at 4100 rpm. The engine also features Active Fuel Management (AFM), also known as cylinder deactivation, which shuts down four of the cylinders during light-load driving conditions to improve fuel economy. The engine is mated to a six-speed automatic transmission (likely the 6L80-E), chosen for its smooth shifting and ability to handle the engine’s torque output. This transmission features electronically controlled shifting and overdrive for highway cruising.
Driving Characteristics
The 5.3L V8 and six-speed automatic combination in the Sierra 1500 Double Cab delivers a comfortable and capable driving experience. While not as quick as the available 6.2-liter V8, the 5.3L provides ample power for everyday driving and towing. The automatic transmission is well-tuned, offering smooth and predictable shifts. The gear ratios are optimized for both acceleration and fuel economy. Compared to the available diesel engine options, the 5.3L offers a more traditional V8 sound and feel, but with lower fuel economy. The weight distribution, typical of a body-on-frame pickup, contributes to a stable feel, even when carrying a load. The rear-wheel-drive configuration provides a responsive driving experience, although four-wheel drive was a popular option.
Equipment & Trim Levels
The Sierra 1500 Double Cab with the 5.3L V8 was available in a range of trim levels, including SLE, Elevation, and SLT. The SLE trim typically included standard features such as air conditioning, power windows and locks, a basic infotainment system with a touchscreen display, and cloth upholstery. The Elevation trim added features like a more aggressive exterior styling, alloy wheels, and an upgraded infotainment system. The SLT trim offered premium features such as leather upholstery, heated and ventilated front seats, a Bose audio system, and advanced safety technologies. Optional extras included a sunroof, navigation system, and a variety of driver-assistance features.
Chassis & Braking
The Sierra 1500 utilizes a traditional body-on-frame construction, providing a robust and durable platform. The front suspension features independent coil springs, while the rear suspension employs a rigid axle with leaf springs. This setup is designed to provide a comfortable ride while maintaining good load-carrying capacity. Braking duties are handled by ventilated disc brakes on all four wheels. Anti-lock braking system (ABS) is standard. The steering system is a rack-and-pinion setup with electric power steering, providing responsive and precise steering feel.
Market Reception & Comparison
The GMC Sierra 1500 with the 5.3L V8 and automatic transmission was generally well-received by critics and consumers. It was praised for its comfortable ride, spacious interior, and capable powertrain. Fuel economy was considered adequate for a full-size pickup, but not class-leading. Compared to the Ford F-150 and Ram 1500, the Sierra 1500 offered a similar level of capability and refinement. The Sierra often appealed to buyers who preferred GMC’s more upscale styling and features compared to Chevrolet’s Silverado, with which it shares many components.
Legacy
The L82 5.3L V8 engine has proven to be a reliable and durable powertrain. Sierra 1500s from this generation, particularly those well-maintained, continue to be popular on the used car market. The six-speed automatic transmission is also known for its longevity. Common maintenance items include regular oil changes, fluid checks, and spark plug replacements. While the GMTT1XX platform is now superseded by newer generations, the 2018-2021 Sierra 1500 with the 5.3L V8 remains a capable and dependable full-size pickup truck, offering a good balance of performance, comfort, and value.
