The GMC Sierra 1500 V (GMTT1XX) Crew Cab Standard Box, equipped with the 6.2-liter V8 engine and four-wheel drive, represents a significant iteration of GMC’s full-size pickup truck. Produced from 2018 to 2021, this variant occupied a premium position within the Sierra 1500 lineup, offering a blend of substantial power, towing capacity, and interior comfort. It was part of the fourth generation of the Sierra, known as the GMTT1XX platform, which brought advancements in technology, materials, and overall refinement compared to its predecessors. This configuration targeted buyers needing a capable work truck with the amenities expected of a modern, full-size pickup.
Technical Specifications
| Brand | GMC |
| Model | Sierra 1500 |
| Generation | Sierra 1500 V (GMTT1XX) Crew Cab Standard Box |
| Type (Engine) | 6.2 V8 (420 Hp) 4WD 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) | 11.8 l/100 km (19.9 US mpg, 23.9 UK mpg, 8.5 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 5.4 kg/Hp, 186.3 Hp/tonne |
| Weight-to-torque ratio | 3.6 kg/Nm, 276.4 Nm/tonne |
| Power | 420 Hp @ 5600 rpm |
| Power per litre | 68.2 Hp/l |
| Torque | 623 Nm @ 4100 rpm (459.5 lb.-ft. @ 4100 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | L87 |
| Engine displacement | 6162 cm3 (376.03 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 103.25 mm (4.06 in.) |
| Piston Stroke | 92 mm (3.62 in.) |
| Compression ratio | 11.5:1 |
| 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 capacity | 12.6 l (13.31 US qt | 11.09 UK qt) |
| Kerb Weight | 2254 kg (4969.22 lbs.) |
| Max. weight | 3221 kg (7101.09 lbs.) |
| Max load | 967 kg (2131.87 lbs.) |
| Fuel tank capacity | 91 l (24.04 US gal | 20.02 UK gal) |
| Permitted trailer load with brakes (12%) | 4082 kg (8999.27 lbs.) |
| Length | 6128 mm (241.26 in.) |
| Width including mirrors | 2063 mm (81.22 in.) |
| Height | 1915 mm (75.39 in.) |
| Wheelbase | 3987 mm (156.97 in.) |
| Drivetrain Architecture | All wheel drive (4×4). ICE drives rear wheels, front wheels engaged via clutch. |
| Number of gears and type of gearbox | 10 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 |
INTRODUCTION
The 2018-2021 GMC Sierra 1500 Crew Cab with the 6.2L V8 and 4WD represented a sweet spot for buyers seeking a powerful and capable full-size truck. Positioned as a step up from the base V6 and 5.3L V8 options, it offered significantly more performance and towing capacity. The Crew Cab configuration provided ample interior space for passengers, making it suitable for both work and family use. The GMTT1XX platform, introduced in 2019, brought improvements in ride quality, interior materials, and available technology, solidifying the Sierra’s position as a competitive offering in the highly contested full-size truck segment.
Powertrain & Engine Architecture
At the heart of this Sierra variant lies the GM L87 6.2-liter naturally aspirated V8 engine. This engine is a member of GM’s Small Block family, known for its durability and performance. The L87 features direct injection, a robust cast iron block, and aluminum cylinder heads. It produces 420 horsepower at 5600 rpm and 460 lb-ft of torque at 4100 rpm. The direct injection system optimizes fuel delivery and combustion efficiency, contributing to both power output and improved fuel economy compared to older port-injected designs. The engine utilizes an overhead valve (OHV) valvetrain, a design choice prioritizing simplicity and reliability.
The engine is paired with a 10-speed automatic transmission (specifically the 10L80). This transmission offers a wide gear ratio spread, allowing for both strong acceleration and efficient highway cruising. The 10L80 is electronically controlled and features multiple shift modes, including a tow/haul mode optimized for heavy loads. The transmission’s close gear ratios help keep the engine in its optimal power band, maximizing performance and efficiency.
Driving Characteristics
The 6.2L V8 and 10-speed automatic combination delivers a noticeably more responsive driving experience compared to the lower-displacement engines offered in the Sierra 1500. Acceleration is brisk, and the truck feels confident when merging onto highways or passing other vehicles. The 10-speed transmission shifts smoothly and efficiently, and the tow/haul mode provides enhanced control when towing trailers. While not as fuel-efficient as the V6 or 5.3L options, the 6.2L offers a compelling balance of power and usability. The four-wheel-drive system provides excellent traction in various conditions, making it suitable for both on-road and off-road use. The relatively quick steering response and well-tuned suspension contribute to a comfortable and controlled ride, even when the truck is loaded.
Equipment & Trim Levels
The 6.2L V8 was typically offered on higher trim levels of the Sierra 1500, such as the SLT, AT4, and Denali. Standard features included a user-friendly infotainment system with Apple CarPlay and Android Auto compatibility, a rearview camera, and a suite of safety features. Higher trims added features like leather upholstery, heated and ventilated front seats, a premium sound system, and advanced driver-assistance technologies such as adaptive cruise control and lane-keeping assist. Optional extras included a power sunroof, a bed liner, and various appearance packages.
Chassis & Braking
The Sierra 1500 GMTT1XX utilizes a fully boxed frame for enhanced rigidity and strength. The front suspension features independent coil springs, while the rear suspension employs a traditional leaf spring setup. This configuration provides a good balance of ride comfort and load-carrying capacity. Braking duties are handled by ventilated disc brakes at all four corners. ABS (Anti-lock Braking System) is standard. The braking system is adequately sized for the truck’s weight and performance, providing confident stopping power even when towing.
Market Reception & Comparison
The 6.2L V8-equipped Sierra 1500 received positive reviews from automotive critics. It was praised for its strong performance, comfortable ride, and well-appointed interior. Compared to the 5.3L V8, the 6.2L offered a significant power boost, making it a better choice for those who frequently tow or haul heavy loads. Fuel economy was generally considered acceptable for a full-size truck, although it was lower than that of the V6 or 5.3L options. Reliability reports have been generally positive, with the L87 engine proving to be a durable and dependable powerplant.
Legacy
The GMC Sierra 1500 V (GMTT1XX) Crew Cab with the 6.2L V8 and 4WD continues to be a popular choice in the used truck market. Its combination of power, capability, and comfort makes it a versatile vehicle for a wide range of buyers. The L87 engine has a reputation for long-term reliability, and the 10-speed automatic transmission is known for its smooth operation. Well-maintained examples of this truck can provide many years of reliable service, making it a solid investment for those in need of a capable and dependable full-size pickup.
