The GMC Sierra 1500 V (GMTT1XX) Crew Cab Short Box, equipped with the 5.3L V8 engine and 8-speed automatic transmission, represents a significant iteration of GMC’s full-size pickup truck. Produced from 2018 to 2021, this variant occupied a sweet spot in the Sierra 1500 lineup, offering a balance of capability, comfort, and value. It was part of the fourth generation of the Sierra, known as the GMTT1XX platform, which brought substantial improvements in design, technology, and overall refinement compared to its predecessors. This configuration was aimed at buyers needing a versatile truck for both work and family use, prioritizing a smooth driving experience and ample interior space.
Technical Specifications
| Brand | GMC |
| Model | Sierra 1500 |
| Generation | Sierra 1500 V (GMTT1XX) Crew Cab Short Box |
| Type (Engine) | 5.3 V8 (355 Hp) 8 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) | 13.8 l/100 km (17 US mpg) |
| Fuel consumption (extra urban) | 10.2 l/100 km (23.1 US mpg) |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 6 kg/Hp |
| Weight-to-torque ratio | 4.1 kg/Nm |
| 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 | L84 |
| 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 |
| Engine oil capacity | 7.6 l (8.03 US qt | 6.69 UK qt) |
| Coolant capacity | 13.1 l (13.84 US qt | 11.53 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%) | 4309 kg (9499.72 lbs.) |
| Length | 5886 mm (231.73 in.) |
| Width including mirrors | 2063 mm (81.22 in.) |
| Height | 1917 mm (75.47 in.) |
| Wheelbase | 3745 mm (147.44 in.) |
| Drivetrain Architecture | Rear wheel drive |
| Number of gears and type of gearbox | 8 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 L84 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 L84 utilizes direct fuel injection (DFI) and Active Fuel Management (AFM), also known as cylinder deactivation, to improve fuel economy. AFM allows the engine to operate on four cylinders during light-load conditions, such as highway cruising. The engine features an overhead valve (OHV) valvetrain with variable valve timing (VVT) to optimize performance and efficiency across the rev range. The 8-speed automatic transmission (8L45) paired with the L84 provides smooth and efficient shifting, contributing to improved fuel economy and enhanced towing capability. This transmission features electronically controlled shifting and a wide gear ratio spread for optimal performance in various driving conditions.
Driving Characteristics
The combination of the 5.3L V8 and the 8-speed automatic delivers a comfortable and capable driving experience. While not as quick as the available 6.2L V8, the 5.3L provides ample power for everyday driving and towing. The 8-speed transmission keeps the engine in its optimal power band, resulting in responsive acceleration. The gear ratios are well-suited for both city and highway driving, with a relatively tall final drive ratio contributing to fuel efficiency. Compared to manual transmission equipped Sierras, the automatic offers a more relaxed driving experience, particularly in stop-and-go traffic. The AFM system, while improving fuel economy, can sometimes be noticeable as a slight vibration when transitioning between V8 and V4 modes.
Equipment & Trim Levels
The Sierra 1500 V (GMTT1XX) Crew Cab Short Box 5.3L Automatic was available in various trim levels, including SLE, Elevation, and SLT. Standard features typically 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 the SLT, added features like leather upholstery, heated and ventilated front seats, a premium audio system, and advanced safety technologies like blind-spot monitoring and rear cross-traffic alert. Optional extras included a sunroof, navigation system, and various towing packages.
Chassis & Braking
The Sierra 1500 features a fully boxed frame for enhanced rigidity and durability. The front suspension utilizes an independent coil spring design, providing a comfortable ride and good handling characteristics. The rear suspension employs a traditional leaf spring setup, optimized for load-carrying capacity. Braking duties are handled by ventilated disc brakes on all four wheels. ABS (Anti-lock Braking System) is standard, providing enhanced stopping power and control during emergency braking situations. Steering is rack-and-pinion with electric power steering, offering precise and responsive steering feel.
Market Reception & Comparison
The 5.3L V8/8-speed automatic combination was widely regarded as a practical and well-rounded choice for Sierra 1500 buyers. Critics praised its smooth ride, comfortable interior, and ample power for most tasks. Fuel economy was considered acceptable for a full-size pickup, although it lagged behind some competitors with smaller engines or more advanced fuel-saving technologies. Compared to the 4.3L V6, the 5.3L offered significantly more power and towing capacity. Compared to the 6.2L V8, it provided a more affordable entry point with a slight compromise in outright performance. Reliability was generally good, with the L84 engine proving to be a durable and dependable powerplant.
Legacy
The GMTT1XX Sierra 1500 with the 5.3L V8 and 8-speed automatic has established a solid reputation in the used car market. The L84 engine is known for its longevity, and with proper maintenance, these trucks can provide many years of reliable service. While AFM systems have been known to experience issues in some cases (oil consumption), these are often manageable with regular oil changes and preventative maintenance. These Sierras remain a popular choice for buyers seeking a capable and comfortable full-size pickup at a reasonable price point, offering a good balance of performance, features, and value.
