The GMC Sierra 1500 V, specifically the Regular Cab Long Box configuration with the 5.3L V8 engine and automatic transmission, was a mainstay of GMC’s full-size pickup truck lineup from the 2018 to 2021 model years. Representing the fourth generation of the Sierra (GMTT1XX platform), this variant occupied a sweet spot for buyers needing a capable work truck without the added cost and complexity of higher trim levels or the reduced practicality of shorter bed configurations. It catered to individuals and businesses prioritizing towing capacity, payload, and a straightforward, durable driving experience.
Technical Specifications
| Brand | GMC |
| Model | Sierra 1500 |
| Generation | Sierra 1500 V (GMTT1XX) Regular Cab Long Box |
| 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 | 2 |
| Doors | 2 |
| Fuel consumption (urban) | 15.7 l/100 km (15 US mpg, 18 UK mpg) |
| Fuel consumption (extra urban) | 11.2 l/100 km (21 US mpg, 25.2 UK mpg) |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 5.8 kg/Hp, 173.2 Hp/tonne |
| Weight-to-torque ratio | 3.9 kg/Nm, 253.2 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 | 2050 kg (4519.48 lbs.) |
| Max. weight | 3084 kg (6799.06 lbs.) |
| Max load | 1034 kg (2279.58 lbs.) |
| Fuel tank capacity | 106 l (28 US gal | 23.32 UK gal) |
| Permitted trailer load with brakes (12%) | 4536 kg (10000.17 lbs.) |
| Length | 5832 mm (229.61 in.) |
| Width including mirrors | 2063 mm (81.22 in.) |
| Height | 1920 mm (75.59 in.) |
| Wheelbase | 3545 mm (139.57 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, 345 mm |
| Rear brakes | Ventilated discs, 360 mm |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| 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 Active Fuel Management (cylinder deactivation) to balance power delivery with fuel efficiency. The DFI system precisely meters fuel directly into the combustion chamber, improving combustion efficiency and reducing emissions. Active Fuel Management allows the engine to operate on four cylinders during light-load conditions, such as highway cruising, further enhancing fuel economy. The engine features an overhead valve (OHV) valvetrain with variable valve timing (VVT) on intake valves. The 6-speed automatic transmission (likely the 6L80-E) was a common pairing, chosen for its robustness and ability to handle the engine’s torque output. This transmission features electronically controlled shifts and a tow/haul mode for optimized performance when towing.
Driving Characteristics
The 5.3L V8 with the 6-speed automatic provided a comfortable and capable driving experience. While not as quick as the available 6.2L V8, the 5.3L offered ample power for everyday driving and towing. The automatic transmission was tuned for smooth shifts and predictable behavior. The gear ratios were optimized for both acceleration and highway cruising. The truck felt planted and stable, even when carrying a load. Compared to manual transmission equipped Sierras, the automatic offered greater convenience, particularly in stop-and-go traffic. However, some drivers preferred the more direct control offered by a manual gearbox. The 6-speed automatic, while reliable, lacked the efficiency of newer 8 or 10-speed transmissions found in later Sierra models.
Equipment & Trim Levels
The Regular Cab Long Box 5.3L Automatic Sierra typically came standard with features like air conditioning, a basic infotainment system with a touchscreen display, power windows and locks, and a rearview camera. The interior materials were generally durable and functional, prioritizing practicality over luxury. Higher trim levels, such as SLE and Elevation, added features like upgraded cloth or leather upholstery, a larger touchscreen display, and additional convenience features. Optional extras included a trailer brake controller, a navigation system, and various appearance packages.
Chassis & Braking
The Sierra 1500 V utilized a body-on-frame construction, providing a robust and durable platform. The front suspension featured independent coil springs, while the rear suspension employed a traditional leaf spring setup. This configuration was well-suited for handling heavy loads and providing a comfortable ride. The braking system consisted of ventilated disc brakes on all four wheels, providing adequate stopping power. Anti-lock brakes (ABS) were standard. The rear axle ratio varied depending on the specific configuration, influencing both towing capacity and fuel economy.
Market Reception & Comparison
The 5.3L V8 Automatic Sierra 1500 was generally well-received by critics and consumers alike. It was praised for its strong towing capacity, comfortable ride, and relatively affordable price point. Fuel economy was considered adequate for a full-size pickup truck, but not exceptional. Compared to the 6.2L V8, the 5.3L offered a better balance of power and fuel efficiency. Compared to the 2.7L Turbo, the 5.3L offered more proven reliability and a more traditional V8 driving experience. The 5.3L was often seen as the “workhorse” of the Sierra lineup, appealing to buyers who prioritized capability and durability over outright performance.
Legacy
The L82 5.3L V8 and 6L80-E automatic transmission pairing proved to be a reliable and durable combination. These powertrains have a good reputation for longevity, even with high mileage. In the used car market, these Sierras represent a good value for buyers seeking a capable and affordable full-size pickup truck. While not the most technologically advanced or fuel-efficient option available, the 2018-2021 Sierra 1500 V with the 5.3L V8 remains a popular choice for those who need a dependable work truck that can handle a variety of tasks.
