The GMC Sierra 1500 AT4 5.3L V8 4WD Automatic, introduced as part of the GMTT1XX generation’s facelift in 2022, represents a compelling blend of capability, technology, and comfort within the full-size pickup truck segment. Positioned as a mid-to-upper trim level, the AT4 caters to buyers seeking a truck with enhanced off-road prowess and a more premium interior without venturing into the luxury territory of the Denali trim. This variant builds upon the established Sierra 1500 platform, offering a robust powertrain and a feature set designed for both work and recreational use. The 2022 refresh brought updated styling, improved interior materials, and enhanced technology features, solidifying the Sierra’s position as a strong competitor against the Ford F-150, Ram 1500, and Chevrolet Silverado.
Technical Specifications
| Brand | GMC |
| Model | Sierra 1500 |
| Generation | Sierra 1500 V (GMTT1XX, facelift 2022) Double Cab |
| 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 | 6.7 kg/Hp, 148.2 Hp/tonne |
| Weight-to-torque ratio | 4.6 kg/Nm, 216.7 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 | 2395 kg (5280.07 lbs.) |
| Max. weight | 3311 kg (7299.51 lbs.) |
| Max load | 916 kg (2019.43 lbs.) |
| Fuel tank capacity | 91 l (24.04 US gal | 20.02 UK gal) |
| Permitted trailer load with brakes (12%) | 4944 kg (10899.65 lbs.) |
| Length | 5891 mm (231.93 in.) |
| Width | 2063 mm (81.22 in.) |
| Width including mirrors | 2478 mm (97.56 in.) |
| Height | 1921 mm (75.63 in.) |
| Wheelbase | 3745 mm (147.44 in.) |
| Ride height (ground clearance) | 205 mm (8.07 in.) |
| Approach angle | 19.2° |
| Departure angle | 23.9° |
| Ramp-over (brakeover) angle | 19.4° |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the rear wheels permanently, and the front wheels are driven through an electrically or mechanically operated clutch if necessary. |
| Drive wheel | All wheel drive (4×4) |
| 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 |
| 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 lies 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 injection (DI) and Active Fuel Management (AFM), a cylinder deactivation system that shuts down four cylinders during light-load cruising to improve fuel economy. The engine produces 355 horsepower at 5600 rpm and 383 lb-ft of torque at 4100 rpm. The valvetrain employs an overhead valve (OHV) configuration with variable valve timing (VVT) on intake valves. The engine is longitudinally mounted in the chassis. Paired with the L84 is a 10-speed automatic transmission (specifically the 10L80) which provides a wide gear ratio spread for both towing and fuel efficiency. This transmission is electronically controlled and features a tow/haul mode for optimized performance when towing trailers.
Driving Characteristics
The 5.3L V8 and 10-speed automatic combination delivers a balanced driving experience. While not as quick as the available 6.2L V8, the 5.3L provides ample power for everyday driving and towing. The 10-speed transmission allows the engine to stay within its optimal power band, resulting in smooth acceleration and responsive shifts. The AT4 trim’s off-road-tuned suspension provides a comfortable ride on paved roads while also enhancing capability on rough terrain. The 4WD system offers selectable modes for various conditions, including Auto, 4HI, and 4LO. Compared to the 2.7L Turbo or the diesel options, this configuration prioritizes readily available torque and a traditional V8 sound, appealing to buyers who prefer a more familiar driving experience.
Equipment & Trim Levels
The AT4 trim level comes standard with a generous array of features. Interior appointments include leather upholstery, heated and ventilated front seats, and a premium audio system. Standard technology includes an 8-inch touchscreen infotainment system with Apple CarPlay and Android Auto compatibility, as well as a suite of safety features such as automatic emergency braking, lane departure warning, and forward collision alert. Optional extras for the AT4 included a larger touchscreen, a head-up display, adaptive cruise control, and a power-adjustable steering column. The exterior features unique styling cues, including black chrome accents, a distinctive grille, and off-road tires.
Chassis & Braking
The Sierra 1500 AT4 utilizes a body-on-frame construction, providing a robust and durable platform. The front suspension consists of independent coil springs, while the rear suspension employs a traditional leaf spring setup. The AT4 trim benefits from a slightly raised suspension for increased ground clearance. Braking duties are handled by ventilated disc brakes on all four wheels. The front brakes measure 330x30mm, while the rear brakes are 345x20mm. The vehicle is equipped with an anti-lock braking system (ABS) and electronic stability control.
Market Reception & Comparison
The GMC Sierra 1500 AT4 5.3L V8 4WD Automatic was generally well-received by automotive critics. Reviewers praised its comfortable ride, capable powertrain, and well-appointed interior. Fuel economy was considered average for a full-size pickup truck, with EPA estimates around 15 mpg city and 19 mpg highway. Compared to the Chevrolet Silverado, which shares the same platform, the Sierra AT4 offered a more upscale interior and unique styling. Against competitors like the Ford F-150 and Ram 1500, the Sierra AT4 held its own, offering a compelling combination of features and capability.
Legacy
The L84 5.3L V8 engine has proven to be a reliable and durable powertrain. While not without its potential issues (such as AFM lifter failure in some model years), the engine is generally considered to be well-engineered and capable of lasting for many years with proper maintenance. In the used car market, the 2022 Sierra 1500 AT4 5.3L V8 4WD Automatic holds its value well, reflecting its popularity and reputation for reliability. The GMTT1XX generation Sierra, and particularly the AT4 trim, represents a significant step forward in terms of refinement, technology, and capability for GMC’s full-size pickup truck lineup.
