The GMC Sierra 1500 V (GMTT1XX) Double Cab, equipped with the 4.3L V6 engine and automatic transmission, was a popular configuration within the Sierra 1500 lineup produced between 2018 and 2020. Representing the fourth generation of the Sierra 1500, the GMTT1XX series aimed to balance capability with improved fuel efficiency and interior refinement. This particular variant served as a strong mid-range offering, appealing to buyers seeking a capable full-size pickup without the higher price tag of the larger V8 engines or more luxurious trim levels. It was positioned as a workhorse truck suitable for both daily driving and moderate towing/hauling tasks.
Technical Specifications
| Brand | GMC |
| Model | Sierra 1500 |
| Generation | Sierra 1500 V (GMTT1XX) Double Cab |
| Type (Engine) | 4.3 V6 (285 Hp) Automatic |
| Start of production | 2018 |
| End of production | 2020 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 14.7 l/100 km (16 US mpg, 19.2 UK mpg, 6.8 km/l) |
| Fuel consumption (extra urban) | 11.2 l/100 km (21 US mpg, 25.2 UK mpg, 8.9 km/l) |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 7.5 kg/Hp, 133.7 Hp/tonne |
| Weight-to-torque ratio | 5.2 kg/Nm, 193.7 Nm/tonne |
| Power | 285 Hp @ 5300 rpm |
| Power per litre | 66.3 Hp/l |
| Torque | 413 Nm @ 3900 rpm (304.61 lb.-ft. @ 3900 rpm) |
| Maximum engine speed | 5800 rpm |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | LV3 |
| Engine displacement | 4301 cm3 (262.46 cu. in.) |
| Number of cylinders | 6 |
| Engine configuration | V-engine |
| Cylinder Bore | 99.6 mm (3.92 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 |
| Engine oil capacity | 5.7 l (6.02 US qt | 5.02 UK qt) |
| Coolant capacity | 11.5 l (12.15 US qt | 10.12 UK qt) |
| Kerb Weight | 2132 kg (4700.26 lbs.) |
| Max. weight | 3130 kg (6900.47 lbs.) |
| Max load | 998 kg (2200.21 lbs.) |
| Fuel tank capacity | 91 l (24.04 US gal | 20.02 UK gal) |
| Length | 5886 mm (231.73 in.) |
| Width including mirrors | 2063 mm (81.22 in.) |
| Height | 1921 mm (75.63 in.) |
| Wheelbase | 3745 mm (147.44 in.) |
| Drivetrain Architecture | Rear wheel drive |
| 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, 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 | 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 4.3L (262 cubic inch) LV3 V6 engine. This engine is a member of GM’s EcoTec3 family, known for its aluminum block construction and direct fuel injection. The LV3 utilizes a 60-degree V-angle and features variable valve timing for improved efficiency and performance. The direct injection system, coupled with a compression ratio of 11:1, contributes to a respectable 285 horsepower and 304 lb-ft of torque. The engine employs an overhead valve (OHV) valvetrain, a design choice that prioritizes compactness and cost-effectiveness. The engine is paired with a six-speed automatic transmission (likely the 6L80) designed to provide smooth shifting and efficient power delivery. This transmission was a common choice for GM trucks and SUVs of this era.
Driving Characteristics
The 4.3L V6 and six-speed automatic combination in the Sierra 1500 Double Cab delivers adequate performance for everyday driving and typical pickup truck duties. While not as quick as the available 5.3L or 6.2L V8 engines, the V6 provides sufficient power for merging onto highways and maintaining speed on inclines. The automatic transmission is tuned for smooth operation and generally avoids excessive hunting for gears. However, drivers may notice some hesitation during quick acceleration or when towing heavier loads. The gear ratios are optimized for fuel economy and towing capability rather than outright performance. Compared to a manual transmission equipped Sierra, the automatic offers greater convenience, especially in stop-and-go traffic, but sacrifices some driver control and potentially fuel efficiency.
Equipment & Trim Levels
The 4.3L V6 engine was typically offered on the SLE and Elevation trims of the Sierra 1500 Double Cab. Standard features generally included air conditioning, power windows and locks, a basic infotainment system with a touchscreen display, and a rearview camera. Higher trim levels added features such as leather upholstery, heated seats, a premium sound system, and advanced safety technologies. Optional extras for this variant could include a trailer towing package, upgraded wheels, and various convenience packages. The interior materials were generally durable and functional, reflecting the truck’s work-oriented nature.
Chassis & Braking
The Sierra 1500 Double Cab 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. This configuration balances ride comfort with load-carrying capacity. The braking system features ventilated discs on all four wheels, with ABS (Anti-lock Braking System) as standard equipment. The front brakes measure 330x30mm, while the rear brakes are 345x20mm. Steering is rack-and-pinion with electric power assist, providing responsive and precise handling.
Market Reception & Comparison
The 4.3L V6 Sierra 1500 Double Cab was generally well-received by critics as a practical and affordable option in the full-size pickup segment. It offered a good balance of capability, fuel economy, and price. Compared to the 5.3L V8, the V6 delivered slightly better fuel economy, although at the expense of some towing capacity and acceleration. The V6 was also more affordable to purchase and maintain. Against competitors like the Ford F-150 with its 3.5L EcoBoost engine, the Sierra’s V6 offered a more traditional engine experience, lacking the turbocharging complexity of the Ford. Reliability reports suggest the LV3 engine is generally dependable, although some owners have reported issues with oil consumption over time.
Legacy
The GMTT1XX Sierra 1500 with the 4.3L V6 and automatic transmission remains a relatively common sight on the used car market. Its affordability and proven reliability make it an attractive option for buyers seeking a capable and dependable pickup truck. While not the most powerful or luxurious option available, this variant provides a solid foundation for work and everyday use. The LV3 engine, while not without its quirks, has proven to be a durable and long-lasting powerplant when properly maintained. As these trucks age, regular maintenance and attention to potential oil consumption issues will be key to ensuring their continued longevity.
