The GMC Sierra 1500 IV, specifically the Regular Cab Long Box configuration with the 4.3 EcoTec3 V6 engine and four-wheel drive, was a mainstay of GMC’s full-size pickup truck lineup from 2016 to 2018. This variant represented a work-focused, value-oriented option within the broader Sierra 1500 range, positioned below the more luxurious and powerful trims featuring larger engines. It was part of the GMTK2XX platform, a significant update to GMC’s truck architecture, offering improved capability and refinement over its predecessors. The facelift in 2016 brought updated styling and technology to the Sierra line.
Technical Specifications
| Brand | GMC |
| Model | Sierra 1500 |
| Generation | Sierra 1500 IV (GMTK2XX, facelift 2016) Regular Cab Long Box |
| Type (Engine) | 4.3 EcoTec3 V6 (285/297 Hp) 4WD Automatic FlexFuel |
| Start of production | 2016 |
| End of production | 2018 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 3 |
| Doors | 2 |
| Fuel consumption (urban) | 13.8 l/100 km (17 US mpg, 20.5 UK mpg) |
| Fuel consumption (extra urban) | 10.7 l/100 km (22 US mpg, 26.4 UK mpg) |
| Fuel Type | Petrol / Ethanol – E85 |
| Weight-to-power ratio | 7.9 kg/Hp, 126.3 Hp/tonne |
| Weight-to-torque ratio | 5.5 kg/Nm, 183.1 Nm/tonne |
| Power | 285 Hp @ 5300 rpm |
| Power per litre | 66.3 Hp/l |
| Power (Ethanol – E85) | 297 Hp @ 5300 rpm |
| Power per litre (Ethanol – E85) | 69.1 Hp/l |
| Torque | 413 Nm @ 3900 rpm (304.61 lb.-ft. @ 3900 rpm) |
| Torque (Ethanol – E85) | 447 Nm @ 3900 rpm |
| Maximum engine speed | 5800 rpm |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | LV3 |
| Engine displacement | 4300 cm3 (262.4 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 | 14 l (14.79 US qt | 12.32 UK qt) |
| Kerb Weight | 2256 kg (4973.63 lbs.) |
| Max. weight | 3130 kg (6900.47 lbs.) |
| Max load | 874 kg (1926.84 lbs.) |
| Trunk (boot) space – minimum | 2162 l (76.35 cu. ft.) |
| Fuel tank capacity | 128 l (33.81 US gal | 28.16 UK gal) |
| Permitted trailer load with brakes (12%) | 3357 kg (7400.92 lbs.) |
| Length | 5701 mm (224.45 in.) |
| Width including mirrors | 2032 mm (80 in.) |
| Height | 1875 mm (73.82 in.) |
| Wheelbase | 3378 mm (132.99 in.) |
| Front track | 1745 mm (68.7 in.) |
| Rear (Back) track | 1716 mm (67.56 in.) |
| Ride height (ground clearance) | 223 mm (8.78 in.) |
| Minimum turning circle (turning diameter) | 13.4 m (43.96 ft.) |
| Approach angle | 15.5° |
| Departure angle | 23.4° |
| Ramp-over (brakeover) angle | 21.3° |
| 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 | 6 gears, automatic transmission Hydra-Matic |
| 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 | 245/70 R17; 265/70 R17 |
| Wheel rims size | 8J x 17 |
Powertrain & Engine Architecture
The heart of this Sierra 1500 variant is the 4.3L LV3 EcoTec3 V6 engine. This engine is a naturally aspirated, direct-injected powerplant featuring a 11:1 compression ratio and an overhead valve (OHV) valvetrain. The EcoTec3 family was designed for efficiency and durability, incorporating features like cylinder deactivation to improve fuel economy under light load conditions. The direct injection system optimizes combustion, contributing to both power and efficiency. When running on E85 fuel, the engine management system adjusts to deliver a slight power increase to 297 horsepower. The engine is longitudinally mounted in the chassis. The powertrain is paired with a six-speed Hydra-Matic automatic transmission, chosen for its durability and suitability for truck applications. This transmission provides smooth shifts and adequate gear ratios for both towing and everyday driving.
Driving Characteristics
The 4.3L V6 with the six-speed automatic delivers adequate, but not exhilarating, performance. With 285 horsepower and 304 lb-ft of torque, acceleration is sufficient for typical pickup truck duties, but it won’t compete with the quicker, larger-engine Sierra models. The automatic transmission is tuned for practicality, prioritizing smooth shifts over aggressive downshifts. The gear ratios are optimized for towing and hauling, meaning that initial acceleration from a stop can feel somewhat leisurely. Compared to the available 5.3L or 6.2L V8 engines, this variant offers significantly less power and towing capacity. However, it provides a more fuel-efficient and affordable option for buyers who don’t require maximum capability. The 4WD system provides enhanced traction in inclement weather and on unpaved surfaces.
Equipment & Trim Levels
The Regular Cab Long Box 4.3L 4WD Sierra 1500 typically came with a relatively basic level of standard equipment. Interior features generally included cloth upholstery, a basic infotainment system with a touchscreen display, and air conditioning. Power windows and locks were often standard, but higher-end features like leather seats, a premium sound system, and advanced safety technologies were typically optional or reserved for higher trim levels. Exterior features included steel wheels, black door handles and mirrors, and a standard bed liner. Optional extras could include upgraded wheels, chrome exterior trim, and a towing package.
Chassis & Braking
The Sierra 1500 IV utilizes a body-on-frame construction, providing a robust and durable platform. The front suspension features independent coil springs, while the rear suspension employs a traditional leaf spring setup. This configuration is designed to handle heavy loads and provide a comfortable ride. Braking duties are handled by ventilated disc brakes at all four corners, with ABS (Anti-lock Braking System) as standard equipment. The rear brakes are slightly smaller in diameter than the front brakes. The truck’s relatively high ground clearance (8.78 inches) allows for moderate off-road capability.
Market Reception & Comparison
The 4.3L Sierra 1500 was generally well-received as a value-oriented work truck. Critics praised its fuel efficiency compared to the V8 models, and its durability. However, some reviewers noted its lack of power and refinement compared to competitors and higher-trim Sierra models. Fuel economy figures averaged around 17 mpg in the city and 22 mpg on the highway. Compared to the 5.3L V8, the 4.3L offered a noticeable fuel economy improvement, but at the cost of significant performance. The 4.3L was often favored by fleet buyers and individuals who prioritized affordability and fuel efficiency over outright power.
Legacy
The 4.3L EcoTec3 V6 proved to be a relatively reliable powertrain. While not without its share of minor issues, the engine and transmission generally held up well over time with proper maintenance. In the used car market, these Sierra 1500s represent an affordable entry point into full-size truck ownership. They are often sought after by buyers who need a capable and dependable truck for work or hauling, but don’t want to pay the premium for a larger engine. The availability of parts and service remains good, ensuring that these trucks can be kept on the road for many years to come.
