The GMC Sierra 1500 AT4 6.2 V8, introduced as part of the GMTT1XX generation’s facelift in 2022, represents a significant offering in the full-size pickup truck segment. Positioned as a premium off-road focused trim, the AT4 combines robust capability with a refined interior and a powerful powertrain. This particular configuration – Crew Cab, Standard Box, paired with the 6.2-liter V8 engine and a 10-speed automatic transmission, and four-wheel drive – aims to deliver a balance of work-ready functionality and comfortable daily driving. The 2022 refresh brought updated styling, enhanced technology, and continued improvements to the Sierra’s already strong foundation.
Technical Specifications
| Brand | GMC |
| Model | Sierra 1500 |
| Generation | Sierra 1500 V (GMTT1XX, facelift 2022) Crew Cab Standard Box |
| Type (Engine) | AT4 6.2 V8 (420 Hp) 4WD Automatic |
| Start of production | 2022 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 16.8 l/100 km (14 US mpg, 16.8 UK mpg) |
| Fuel consumption (extra urban) | 13.8 l/100 km (17 US mpg, 20.5 UK mpg) |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 6 kg/Hp, 165.9 Hp/tonne |
| Weight-to-torque ratio | 4.1 kg/Nm, 246.1 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, VVT DI |
| Engine oil capacity | 7.6 l (8.03 US qt | 6.69 UK qt) |
| Coolant | 12.6 l (13.31 US qt | 11.09 UK qt) |
| Kerb Weight | 2531 kg (5579.9 lbs.) |
| Max. weight | 3175 kg (6999.68 lbs.) |
| Max load | 644 kg (1419.78 lbs.) |
| Fuel tank capacity | 91 l (24.04 US gal | 20.02 UK gal) |
| Permitted trailer load with brakes (12%) | 4036 kg (8897.86 lbs.) |
| Length | 6158 mm (242.44 in.) |
| Width | 2063 mm (81.22 in.) |
| Width including mirrors | 2478 mm (97.56 in.) |
| Height | 1987 mm (78.23 in.) |
| Wheelbase | 3989 mm (157.05 in.) |
| Ride height (ground clearance) | 272 mm (10.71 in.) |
| Approach angle | 25.4° |
| Departure angle | 25.9° |
| Ramp-over (brakeover) angle | 19.5° |
| 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 |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 265/65 R18 |
| Wheel rims size | 8.5J x 18 |
Powertrain & Engine Architecture
At the heart of the Sierra 1500 AT4 is the 6.2-liter L87 V8 engine. This naturally aspirated powerplant utilizes direct injection and active fuel management (cylinder deactivation) to balance performance and efficiency. The engine produces 420 horsepower at 5600 rpm and 460 lb-ft of torque at 4100 rpm. The L87 features an overhead valve (OHV) valvetrain with variable valve timing (VVT) on both intake and exhaust valves. This configuration, while traditional, provides a robust and reliable design. The engine is longitudinally mounted in the chassis. Paired with the engine is a sophisticated 10-speed automatic transmission, providing a wide range of gear ratios for optimized acceleration, towing, and fuel economy. This transmission is a key component in maximizing the engine’s potential and delivering smooth, responsive shifts.
Driving Characteristics
The 6.2L V8 and 10-speed automatic combination delivers strong acceleration and ample power for both daily driving and demanding tasks like towing. The 10-speed transmission keeps the engine in its optimal power band, providing responsive acceleration. While not as fuel-efficient as smaller engine options, the 6.2L offers a satisfying driving experience with its characteristic V8 rumble and effortless power delivery. Compared to the available 5.3L V8 or the 3.0L Duramax diesel, the 6.2L prioritizes outright power over fuel economy. The AT4 trim’s off-road tuned suspension provides a comfortable ride on paved roads while also enhancing capability on rough terrain.
Equipment & Trim Levels
The AT4 trim level is well-equipped, focusing on both comfort and off-road readiness. Standard features include a premium interior with leather upholstery, heated and ventilated front seats, a large touchscreen infotainment system with Apple CarPlay and Android Auto compatibility, and a suite of advanced safety features like automatic emergency braking and lane departure warning. The AT4 also includes unique exterior styling cues, such as a distinctive grille, black chrome accents, and off-road tires. Optional extras include a power-adjustable steering column, a premium audio system, and a rear-seat entertainment system.
Chassis & Braking
The Sierra 1500 AT4 utilizes a fully boxed frame for enhanced rigidity and durability. The front suspension features independent coil springs, while the rear suspension employs a traditional leaf spring setup. The AT4 trim benefits from a factory lift, providing increased ground clearance for off-road adventures. Braking duties are handled by ventilated disc brakes at all four corners. The AT4 also includes an electronic locking rear differential for improved traction in challenging conditions.
Market Reception & Comparison
The GMC Sierra 1500 AT4 has been well-received by critics and consumers alike. It’s praised for its combination of capability, comfort, and styling. Compared to the Chevrolet Silverado, with which it shares a platform, the Sierra offers a more upscale interior and distinctive exterior design. The 6.2L V8 engine is often lauded for its power and responsiveness, although its fuel economy is a common criticism. Against competitors like the Ford F-150 and Ram 1500, the Sierra AT4 holds its own, offering a compelling package for buyers seeking a premium full-size pickup truck.
Legacy
The L87 6.2L V8 engine has proven to be a reliable and durable powerplant. While long-term reliability data is still emerging for the 2022 facelift models, the engine’s core design has been refined over several years. The 10-speed automatic transmission has also demonstrated good reliability. On the used car market, the Sierra 1500 AT4 6.2L V8 commands a premium price due to its desirable combination of features, performance, and capability. The AT4 trim, in particular, has established itself as a popular choice for buyers seeking a well-rounded and capable full-size pickup truck.
