The GMC Sierra 1500 AT4 5.3 V8 4WD Automatic, 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 builds upon the Sierra 1500’s established reputation for capability and comfort. This particular configuration, pairing the 5.3-liter V8 engine with a ten-speed automatic transmission and four-wheel drive, aims to deliver a balance of power, refinement, and all-weather/all-terrain performance. The 2022 refresh brought updated styling, enhanced technology, and interior improvements to the Sierra lineup, solidifying its position as a competitor to the Ford F-150, Ram 1500, and Chevrolet Silverado.
Technical Specifications
| Brand | GMC |
| Model | Sierra 1500 |
| Generation | Sierra 1500 V (GMTT1XX, facelift 2022) Crew Cab Short Box |
| Type (Engine) | AT4 5.3 V8 (355 Hp) 4WD Automatic |
| Start of production | 2022 |
| 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) | 12.4 l/100 km (19 US mpg, 22.8 UK mpg, 8.1 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 7.1 kg/Hp, 141.5 Hp/tonne |
| Weight-to-torque ratio | 4.8 kg/Nm, 206.9 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 | 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 | 2508 kg (5529.19 lbs.) |
| Max. weight | 3175 kg (6999.68 lbs.) |
| Max load | 667 kg (1470.48 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 | 5916 mm (232.91 in.) |
| Width | 2063 mm (81.22 in.) |
| Width including mirrors | 2478 mm (97.56 in.) |
| Height | 1990 mm (78.35 in.) |
| Wheelbase | 3747 mm (147.52 in.) |
| Ride height (ground clearance) | 276 mm (10.87 in.) |
| Approach angle | 25.5° |
| Departure angle | 23.0° |
| Ramp-over (brakeover) angle | 20.9° |
| 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
The heart of the Sierra 1500 AT4 is the 5.3-liter L84 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, a feature that improves efficiency and power output compared to earlier port-injected versions. The engine also incorporates Active Fuel Management (cylinder deactivation), which shuts down four cylinders during light-load driving to further enhance fuel economy. The overhead valve (OHV) valvetrain, while traditional, is paired with variable valve timing (VVT) to optimize performance across the engine’s operating range. The ten-speed automatic transmission (10L80) is a crucial component, providing a wide gear ratio spread for improved acceleration, towing capability, and highway cruising. This transmission is electronically controlled and features a sophisticated shift strategy designed to maximize efficiency and responsiveness.
Driving Characteristics
The 5.3L V8 and 10-speed automatic combination in the Sierra 1500 AT4 delivers a comfortable and capable driving experience. While not as overtly powerful as the available 6.2-liter V8, the 5.3L provides ample torque for everyday driving and towing. The ten-speed transmission keeps the engine in its optimal power band, resulting in smooth and confident acceleration. The AT4 trim’s off-road tuned suspension provides a more controlled ride over rough terrain compared to standard Sierra 1500 models. Compared to a manual transmission equipped Sierra, the automatic offers greater convenience, particularly in stop-and-go traffic. However, it may feel slightly less engaging for drivers who prefer more control over gear selection. The 4WD system provides excellent traction in various conditions, making the AT4 a capable all-weather vehicle.
Equipment & Trim Levels
The AT4 trim level is well-equipped, focusing on both comfort and off-road capability. Standard features typically include leather upholstery, heated and ventilated front seats, a premium audio system, and a large infotainment touchscreen with Apple CarPlay and Android Auto compatibility. The AT4 also features unique exterior styling cues, such as black chrome accents and distinctive wheels. Available options include a power-adjustable steering column, a panoramic sunroof, and advanced safety features like adaptive cruise control and lane keeping assist. The interior generally features a dark, rugged aesthetic reflecting the AT4’s off-road focus.
Chassis & Braking
The Sierra 1500 AT4 utilizes a body-on-frame construction, providing a robust and durable platform. The suspension consists of independent coil springs in the front and a traditional leaf spring setup in the rear. The AT4 trim often includes upgraded shock absorbers and a slightly raised ride height for improved off-road performance. Braking duties are handled by ventilated disc brakes at all four corners. The anti-lock braking system (ABS) is standard, providing enhanced stopping power and stability. Steering is rack-and-pinion with electric power assist, offering a responsive and precise feel.
Market Reception & Comparison
The GMC Sierra 1500 AT4 has been well-received by critics and consumers alike. It’s praised for its comfortable ride, capable powertrain, and distinctive styling. Compared to the Chevrolet Silverado, which shares the same platform, the Sierra offers a more upscale interior and unique exterior design. The 5.3L V8/10-speed automatic combination strikes a good balance between performance and fuel economy, although it doesn’t match the efficiency of the available diesel engine. Reliability has generally been good, although some owners have reported minor issues with the infotainment system.
Legacy
The GMTT1XX generation Sierra 1500, and specifically the 2022 facelifted models like the AT4 5.3L, represent a refinement of a long-standing formula for full-size pickup trucks. The L84 5.3L V8, paired with the 10-speed automatic, has proven to be a durable and reliable powertrain. On the used car market, these models hold their value relatively well, particularly the AT4 trim due to its desirable features and off-road capability. As technology continues to evolve, these trucks will likely be remembered as a transitional point between traditional internal combustion engines and the increasing adoption of hybrid and electric powertrains.
