The GMC Sierra 1500 V (GMTT1XX) Regular Cab Standard Box, equipped with the 5.3L V8 engine and automatic transmission, represents a work-focused iteration of GMC’s full-size pickup truck lineage. Produced from 2018 to 2021, this configuration occupied a significant position in the Sierra 1500 lineup, offering a balance between capability, affordability, and traditional truck values. It catered to buyers prioritizing a no-frills, robust vehicle for hauling and towing, rather than luxury appointments. This variant was part of the GMTT1XX generation, a substantial redesign of the Sierra 1500, focusing on improved strength, technology, and efficiency compared to its predecessors.
Technical Specifications
| Brand | GMC |
| Model | Sierra 1500 |
| Generation | Sierra 1500 V (GMTT1XX) Regular Cab Standard 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, 172.7 Hp/tonne |
| Weight-to-torque ratio | 4 kg/Nm, 252.6 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 |
| Coolant | 12.8 l (13.53 US qt | 11.26 UK qt) |
| Kerb Weight | 2055 kg (4530.5 lbs.) |
| Max. weight | 3084 kg (6799.06 lbs.) |
| Max load | 1029 kg (2268.56 lbs.) |
| Permitted trailer load with brakes (12%) | 4536 kg (10000.17 lbs.) |
| Length | 5356 mm (210.87 in.) |
| Width including mirrors | 2063 mm (81.22 in.) |
| Height | 1923 mm (75.71 in.) |
| Wheelbase | 3213 mm (126.5 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 |
| Wheel rims size | 8.0J x 17 |
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, a significant upgrade from earlier throttle-body injection systems, contributing to improved fuel efficiency and power output. The engine features an overhead valve (OHV) valvetrain, a traditional design choice that prioritizes simplicity and low-end torque. Cylinder deactivation (Dynamic Fuel Management) is a key feature, allowing the engine to operate on four cylinders during light-load conditions, further enhancing fuel economy. The engine is mated to a six-speed automatic transmission (likely the 6L80-E), a robust unit designed to handle the engine’s torque output and the demands of truck usage. This transmission offers smooth shifts and a wide gear ratio spread, optimizing both acceleration and fuel efficiency.
Driving Characteristics
The 5.3L V8 with the six-speed automatic delivers adequate, though not exhilarating, performance. With 355 horsepower and 383 lb-ft of torque, the truck provides sufficient power for everyday driving and moderate towing. Acceleration is respectable, but the weight of the vehicle and the conservative tuning of the automatic transmission prevent it from feeling particularly quick. The automatic transmission is programmed for smooth, comfortable shifts, prioritizing drivability over aggressive performance. Compared to the available 6.2L V8, this engine offers less power and acceleration. However, it provides a noticeable improvement in fuel economy. The gear ratios are optimized for towing and hauling, providing ample low-end torque for getting work done.
Equipment & Trim Levels
The Regular Cab Standard Box configuration typically represented the entry-level trim for the Sierra 1500. Standard features generally included air conditioning, a basic infotainment system with a touchscreen display, power windows and locks, and a rearview camera. Interior upholstery was typically vinyl or cloth. Optional extras could include upgraded infotainment systems with navigation, a premium sound system, remote start, and various towing packages. The focus was on providing essential features at an affordable price point, rather than offering a luxurious interior.
Chassis & Braking
The Sierra 1500 V (GMTT1XX) utilized a fully boxed frame, contributing to its robust construction and towing capacity. The front suspension featured independent coil springs, providing a comfortable ride. The rear suspension employed a traditional leaf spring setup, optimized for load-carrying capability. Braking duties were handled by ventilated disc brakes at all four corners, providing adequate stopping power. An Anti-lock Braking System (ABS) was standard. The rear axle ratio varied depending on the specific configuration, influencing both towing capacity and fuel economy.
Market Reception & Comparison
Critics generally viewed the 5.3L V8/automatic combination as a sensible choice for buyers prioritizing practicality and affordability. While not the most powerful or fuel-efficient option, it offered a good balance of both. Fuel economy figures were competitive for a full-size pickup truck, though still relatively high compared to smaller vehicles. Reliability was generally good, with the L82 engine proving to be a durable and dependable powerplant. Compared to the 6.2L V8, the 5.3L offered lower initial cost and slightly better fuel economy, but at the expense of performance. Compared to the available diesel engine options, the 5.3L provided lower torque but a simpler and potentially less expensive maintenance schedule.
Legacy
The GMTT1XX Sierra 1500 with the 5.3L V8 and automatic transmission remains a popular choice in the used truck market. The L82 engine is known for its longevity, and with proper maintenance, can reliably exceed 200,000 miles. The six-speed automatic transmission is also generally considered to be durable. These trucks offer a compelling value proposition for buyers seeking a capable and affordable work truck. While newer Sierra 1500 models offer more advanced technology and features, the GMTT1XX generation remains a solid and dependable option for those who prioritize functionality and value.
