The GMC Sierra 1500 V (GMTT1XX) Regular Cab Standard Box, equipped with the 5.3-liter V8 engine producing 355 horsepower and paired with a 4WD automatic transmission, was a mainstay of GMC’s full-size pickup truck lineup from 2018 to 2021. This configuration represented a popular balance between capability, affordability, and everyday usability within the broader Sierra 1500 range. It catered to buyers needing a robust work truck or a capable hauler without the added expense of higher trim levels or more powerful engine options. The GMTT1XX designation refers to the truck’s platform, representing a significant update to the Sierra 1500 series.
Technical Specifications
| Brand | GMC |
| Model | Sierra 1500 |
| Generation | Sierra 1500 V (GMTT1XX) Regular Cab Standard Box |
| Type (Engine) | 5.3 V8 (355 Hp) 4WD Automatic |
| Start of production | 2018 |
| End of production | 2021 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 2 |
| Doors | 2 |
| 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 | 5.9 kg/Hp, 169.5 Hp/tonne |
| Weight-to-torque ratio | 4 kg/Nm, 247.7 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 | L82 |
| 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 |
| Coolant Capacity | 12.8 l (13.53 US qt | 11.26 UK qt) |
| Kerb Weight | 2095 kg (4618.68 lbs.) |
| Max. weight | 3084 kg (6799.06 lbs.) |
| Max load | 989 kg (2180.37 lbs.) |
| Permitted trailer load with brakes (12%) | 3493 kg (7700.75 lbs.) |
| Length | 5356 mm (210.87 in.) |
| Width including mirrors | 2063 mm (81.22 in.) |
| Height | 1927 mm (75.87 in.) |
| Wheelbase | 3213 mm (126.5 in.) |
| Drivetrain Architecture | All wheel drive (4×4). ICE drives rear wheels, front wheels engaged via clutch. |
| Number of gears and type of gearbox | 6 gears, automatic transmission |
| Front suspension | Independent coil spring |
| Rear suspension | Rigid axle suspension, Leaf spring |
| Front brakes | Ventilated discs, 345 mm |
| Rear brakes | Ventilated discs, 360 mm |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 255/70 R17; 265/70 R17 |
| Wheel rims size | 8.0J x 17 |
Powertrain & Engine Architecture
The heart of this Sierra 1500 variant is the 5.3-liter L82 V8 engine. This engine is a member of GM’s Small Block family, known for its durability and relatively simple design. The L82 utilizes direct fuel injection, a technology that improves fuel efficiency and power output compared to earlier port-fuel injection systems. It also features Active Fuel Management (cylinder deactivation), which shuts down four cylinders during light-load driving conditions to further enhance fuel economy. The engine’s overhead valve (OHV) valvetrain, while traditional, contributes to its robustness and ease of maintenance. The 5.3L V8 is longitudinally mounted in the chassis. The engine is mated to a six-speed automatic transmission (likely the 6L80-E), a common and well-regarded unit known for its smooth shifting and reliability. This transmission is electronically controlled, adapting shift points based on driving conditions and throttle input.
Driving Characteristics
The 5.3L V8 with the six-speed automatic provides adequate power for most everyday tasks, including towing and hauling moderate loads. While not as quick as the available 6.2-liter V8, the 5.3L offers a good balance of performance and fuel economy. The automatic transmission is tuned for smooth, comfortable shifts, prioritizing usability over aggressive performance. The gear ratios are optimized for towing and hauling, providing sufficient torque in lower gears. Compared to a manual transmission equipped Sierra 1500, this variant offers less driver engagement but greater convenience, particularly in stop-and-go traffic. The 4WD system provides enhanced traction in inclement weather and off-road conditions, making it a versatile choice for a wide range of applications.
Equipment & Trim Levels
The Regular Cab Standard Box configuration typically represented the entry-level trim for the Sierra 1500. Standard features generally included air conditioning, a basic infotainment system with a touchscreen display, power windows and locks, and a rearview camera. Interior upholstery was typically vinyl or cloth. Optional extras could include upgraded infotainment systems with navigation, a premium sound system, power-adjustable seats, and various convenience packages. The Regular Cab configuration prioritized functionality over luxury, offering a no-frills interior focused on durability and ease of cleaning.
Chassis & Braking
The Sierra 1500 V (GMTT1XX) utilizes a body-on-frame construction, providing a robust and durable platform for heavy-duty use. The front suspension features independent coil springs, offering a comfortable ride and good handling characteristics. The rear suspension employs a traditional leaf spring setup, designed to handle heavy loads. Braking duties are handled by ventilated disc brakes on all four wheels, providing ample stopping power. An Anti-lock Braking System (ABS) is standard, enhancing safety and control during emergency braking situations. The standard tire size was typically 255/70 R17 or 265/70 R17, providing a good balance of on-road comfort and off-road capability.
Market Reception & Comparison
The 5.3L V8/4WD automatic combination was widely regarded as a sensible and practical choice for Sierra 1500 buyers. Critics praised its reliability, affordability, and capability. Fuel economy, while not exceptional, was considered acceptable for a full-size pickup truck. Compared to the 4.3L V6 option, 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 performance. The Regular Cab configuration, while less popular than Crew Cab models, appealed to buyers who prioritized functionality and affordability over passenger space.
Legacy
The L82 5.3L V8 and 6L80-E automatic transmission combination have proven to be remarkably durable and reliable powertrains. These trucks continue to be popular on the used car market, offering a good value for buyers seeking a capable and dependable pickup truck. While maintenance costs are typical for a full-size truck, the readily available parts and widespread familiarity among mechanics make servicing relatively straightforward. The GMTT1XX platform Sierra 1500, particularly in this configuration, remains a viable option for those needing a workhorse truck that can handle a variety of tasks.
