The GMC Sierra 1500 IV (GMTK2XX) Double Cab, equipped with the 6.2-liter EcoTec3 V8 engine and automatic transmission, represents a significant iteration in GMC’s full-size pickup truck lineage. Produced from 2013 to 2014, this variant occupied a premium position within the fourth generation Sierra 1500 lineup, offering a blend of substantial power, towing capacity, and refined comfort. It was a key offering in the highly competitive North American full-size truck market, appealing to buyers needing a capable workhorse with everyday usability.
Technical Specifications
| Brand | GMC |
| Model | Sierra 1500 |
| Generation | Sierra 1500 IV (GMTK2XX) Double Cab |
| Type (Engine) | 6.2 EcoTec3 V8 (420 Hp) 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) | 15.7 l/100 km (15 US mpg, 18 UK mpg) |
| Fuel consumption (extra urban) | 11.2 l/100 km (21 US mpg, 25.2 UK mpg) |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 5.5 kg/Hp, 182.5 Hp/tonne |
| Weight-to-torque ratio | 3.7 kg/Nm, 270.8 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 | 2301 kg (5072.84 lbs.) |
| Max. weight | 3175 kg (6999.68 lbs.) |
| Max load | 874 kg (1926.84 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%) | 4445 kg (9799.55 lbs.) |
| Length | 5829 mm (229.49 in.) |
| Width including mirrors | 2032 mm (80 in.) |
| Height | 1876 mm (73.86 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) | 216 mm (8.5 in.) |
| Minimum turning circle (turning diameter) | 14.3 m (46.92 ft.) |
| Approach angle | 16.2° |
| Departure angle | 23.1° |
| Ramp-over (brakeover) angle | 18.9° |
| Drivetrain Architecture | Rear wheel drive |
| Drive wheel | Rear wheel drive |
| 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 6.2-liter L86 EcoTec3 V8 engine. This engine is a naturally aspirated, direct-injection powerplant featuring Active Fuel Management (cylinder deactivation) to improve fuel economy under light load conditions. The L86 utilizes a robust cast iron block with aluminum cylinder heads, contributing to its durability. The overhead valve (OHV) valvetrain, while traditional, proved reliable and cost-effective. The direct injection system, coupled with a relatively high 11.5:1 compression ratio, maximized combustion efficiency and power output. The engine is paired with a six-speed Hydra-Matic automatic transmission, known for its smooth shifting and durability. This transmission was specifically tuned to handle the high torque output of the 6.2L V8, offering a balance between performance and fuel efficiency.
Driving Characteristics
The 6.2-liter V8 and six-speed automatic combination delivered strong acceleration and effortless cruising. With 420 horsepower and 459.5 lb-ft of torque, the truck felt responsive in most driving situations. While not as fuel-efficient as the smaller engine options (4.3L or 5.3L V8s), the 6.2L provided a noticeable performance advantage, particularly when towing or hauling heavy loads. The automatic transmission’s gear ratios were well-matched to the engine’s powerband, providing ample torque for everyday driving and confident passing maneuvers. Compared to the 5.3L V8, the 6.2L offered a more refined and powerful driving experience, while the smaller engine prioritized fuel economy. Manual transmission options were available on other Sierra 1500 trims, but the 6.2L was exclusively offered with the six-speed automatic.
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 basic audio system, and cloth upholstery. Higher trim levels, such as the SLT and Denali, added features like leather upholstery, heated seats, a premium audio system, navigation, and advanced safety technologies. The 6.2L engine was generally available on the SLT and Denali trims, positioning it as a more upscale offering. Optional extras included a sunroof, rear-seat entertainment system, and various towing packages.
Chassis & Braking
The GMTK2XX platform featured a fully boxed frame for enhanced rigidity and durability. The front suspension utilized an independent coil spring design, providing a comfortable ride. The rear suspension employed a traditional leaf spring setup, optimized for load-carrying capacity. Braking duties were handled by ventilated disc brakes on all four wheels, with ABS standard. The rear brakes were slightly smaller in diameter than the front brakes, reflecting the weight distribution of the truck. The steering system was a rack-and-pinion setup with electric power steering, offering responsive handling and ease of maneuverability.
Market Reception & Comparison
The 6.2-liter Sierra 1500 received positive reviews for its powerful engine, comfortable ride, and spacious interior. Critics praised its towing capacity and overall refinement. However, fuel economy was a common concern, as the 6.2L engine consumed more fuel than the smaller engine options. Compared to competitors like the Ford F-150 and Ram 1500, the Sierra 1500 offered a competitive package with a strong emphasis on capability and comfort. The 6.2L engine provided a distinct advantage in terms of power and towing capacity, appealing to buyers who prioritized performance over fuel efficiency.
Legacy
The L86 6.2-liter EcoTec3 V8 proved to be a reliable and durable engine, with many examples still in service today. While not immune to typical truck maintenance needs, the engine is generally considered to be well-engineered and relatively trouble-free. The six-speed Hydra-Matic automatic transmission also enjoys a good reputation for reliability. In the used car market, the 6.2-liter Sierra 1500 Double Cab commands a premium price due to its desirable combination of power, capability, and comfort. It remains a popular choice for buyers seeking a capable and well-equipped full-size pickup truck.
