The GMC Sierra 1500 IV (GMTK2XX) Double Cab, equipped with the 6.2 EcoTec3 V8 engine and a four-wheel-drive automatic transmission, represents a significant iteration in GMC’s full-size pickup truck lineage. Produced primarily for the 2013 and 2014 model years, this variant occupied a premium position within the Sierra 1500 lineup, offering a blend of substantial power, towing capacity, and interior comfort. It was part of the fourth generation of the Sierra 1500, designated GMTK2XX, which brought about a complete redesign focused on improved capability and refinement compared to its predecessor.
Technical Specifications
| Brand | GMC |
| Model | Sierra 1500 |
| Generation | Sierra 1500 IV (GMTK2XX) Double Cab |
| Type (Engine) | 6.2 EcoTec3 V8 (420 Hp) 4WD Automatic |
| Start of production | 2013 |
| End of production | 2014 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 16.8 l/100 km (14 US mpg, 16.8 UK mpg) |
| Fuel consumption (extra urban) | 11.8 l/100 km (19.9 US mpg, 23.9 UK mpg) |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 5.8 kg/Hp, 173.1 Hp/tonne |
| Weight-to-torque ratio | 3.9 kg/Nm, 256.7 Nm/tonne |
| Power | 420 Hp @ 5600 rpm |
| Power per litre | 68.2 Hp/l |
| Torque | 623 Nm @ 4100 rpm (459.5 lb.-ft. @ 4100 rpm) |
| Maximum engine speed | 6000 rpm |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | L86 |
| Engine displacement | 6162 cm3 (376.03 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 103.25 mm (4.06 in.) |
| Piston Stroke | 92 mm (3.62 in.) |
| Compression ratio | 11.5:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Direct injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | OHV |
| Engine oil capacity | 8 l (8.45 US qt | 7.04 UK qt) |
| Coolant | 14.8 l (15.64 US qt | 13.02 UK qt) |
| Kerb Weight | 2427 kg (5350.62 lbs.) |
| Max. weight | 3266 kg (7200.3 lbs.) |
| Max load | 839 kg (1849.68 lbs.) |
| Trunk (boot) space – minimum | 1728 l (61.02 cu. ft.) |
| Fuel tank capacity | 98 l (25.89 US gal | 21.56 UK gal) |
| Permitted trailer load with brakes (12%) | 4309 kg (9499.72 lbs.) |
| Length | 5829 mm (229.49 in.) |
| Width including mirrors | 2032 mm (80 in.) |
| Height | 1877 mm (73.9 in.) |
| Wheelbase | 3645 mm (143.5 in.) |
| Front track | 1750 mm (68.9 in.) |
| Rear (Back) track | 1716 mm (67.56 in.) |
| Ride height (ground clearance) | 225 mm (8.86 in.) |
| Minimum turning circle (turning diameter) | 14.3 m (46.92 ft.) |
| Approach angle | 17° |
| Departure angle | 23.1° |
| Ramp-over (brakeover) angle | 19.1° |
| 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 | 245/70R17; 265/70 R17 |
| Wheel rims size | 8J x 17 |
Powertrain & Engine Architecture
At the heart of this Sierra 1500 Double Cab lies the 6.2-liter EcoTec3 V8 engine, designated as the L86. This engine represented a significant advancement in GM’s V8 technology, featuring direct injection, active fuel management (cylinder deactivation), and variable valve timing. The direct injection system allowed for precise fuel delivery, enhancing both power and efficiency. Active Fuel Management enabled the engine to seamlessly switch between four and eight cylinder operation under light load conditions, further improving fuel economy. The engine produced 420 horsepower at 5600 rpm and 459.5 lb.-ft. of torque at 4100 rpm. The Hydra-Matic 6L80 six-speed automatic transmission was the sole transmission option, chosen for its durability and ability to handle the engine’s substantial output. This transmission featured electronically controlled shifts and a wide gear ratio spread, optimizing performance for both towing and everyday driving.
Driving Characteristics
The 6.2L V8 and 6-speed automatic combination delivered robust performance. Acceleration was brisk, and the truck felt confident when merging onto highways or passing other vehicles. While not as fuel-efficient as the smaller 4.3L or 5.3L V8 options, the 6.2L provided a noticeable power advantage, particularly when towing or hauling heavy loads. The automatic transmission shifted smoothly and responsively, although some drivers noted that it could occasionally hunt for gears in certain situations. The 4WD system provided excellent traction in various conditions, making this Sierra a capable work truck and a reliable all-weather vehicle. Compared to a manual transmission equipped Sierra, the automatic offered greater convenience, especially in stop-and-go traffic, but sacrificed some driver engagement and control.
Equipment & Trim Levels
The Double Cab configuration offered a spacious interior with seating for five passengers. Standard features typically included air conditioning, power windows and locks, a tilt steering wheel, and a basic audio system. Higher trim levels, such as the SLT and Denali, added features like leather upholstery, heated seats, a premium audio system, navigation, and a rearview camera. The 2013-2014 Sierra 1500 Double Cab with the 6.2L V8 was generally positioned as a mid-to-high range trim, appealing to buyers who needed substantial power and capability without necessarily opting for the ultimate luxury of the Denali trim.
Chassis & Braking
The GMTK2XX platform featured a fully boxed frame, contributing to its strength and rigidity. The front suspension utilized an independent coil spring design, while the rear suspension employed a traditional leaf spring setup. This combination provided a comfortable ride quality while maintaining good load-carrying capacity. Braking duties were handled by ventilated disc brakes at all four corners, with ABS included as standard equipment. The braking system was adequately sized for the truck’s weight and power, providing confident stopping performance.
Market Reception & Comparison
The 6.2L EcoTec3 V8-equipped Sierra 1500 received generally positive reviews from automotive critics. It was praised for its powerful engine, smooth transmission, and comfortable ride. However, its fuel economy was often cited as a drawback compared to competitors with smaller engines. Compared to the 5.3L V8, the 6.2L offered significantly more power and towing capacity, but at a higher price point and with lower fuel efficiency. The 4.3L V8 was a more economical option, but lacked the performance of the larger engines.
Legacy
The L86 6.2L EcoTec3 V8 has proven to be a relatively reliable engine, although some owners have reported issues with oil consumption and active fuel management system components. The Hydra-Matic 6L80 transmission is also generally considered durable, but regular maintenance, including fluid changes, is crucial for long-term reliability. Today, these Sierra 1500 Double Cabs with the 6.2L V8 hold their value reasonably well, particularly those in good condition with low mileage. They remain a popular choice for buyers seeking a capable and powerful full-size pickup truck.
