2018-2021 GMC Sierra 1500 V (GMTT1XX) Crew Cab Short Box 2.7 Turbo (310 Hp) 4WD Automatic

The GMC Sierra 1500 V (GMTT1XX) Crew Cab Short Box, equipped with the 2.7-liter turbocharged engine producing 310 horsepower and paired with a four-wheel-drive automatic transmission, was a key offering in GMC’s full-size pickup truck lineup from 2018 to 2021. This variant represented a compelling blend of capability, technology, and efficiency, positioned as a strong contender in the increasingly competitive light-duty truck segment. It served as a more accessible entry point into the Sierra 1500 range, offering a balance between performance and affordability compared to the larger displacement V8 options.

Technical Specifications

INTRODUCTION

The 2018-2021 GMC Sierra 1500 V Crew Cab Short Box with the 2.7-liter turbo engine and 4WD automatic transmission represented a significant step forward for GMC in offering a more fuel-efficient and accessible full-size pickup. Built on the GMTT1XX platform, shared with the Chevrolet Silverado, this Sierra variant aimed to attract buyers who didn’t necessarily require the power of a V8 but still desired the capability and space of a crew cab pickup. It slotted into the lineup below the 5.3L and 6.2L V8 options, providing a more economical alternative without sacrificing too much in terms of towing and hauling capacity. This generation Sierra saw a move towards more premium materials and features, aiming to elevate the GMC brand above its Chevrolet counterpart.

Powertrain & Engine Architecture

At the heart of this Sierra 1500 variant lies the GM L3B 2.7-liter turbocharged inline-four cylinder engine. This engine utilizes direct injection and a twin-scroll turbocharger to deliver a respectable 310 horsepower and 473 lb-ft of torque. The engine features a double overhead camshaft (DOHC) valvetrain with variable valve timing (VVT) and direct injection (DI) technology, optimizing both power and efficiency. The L3B engine also incorporates Active Fuel Management (cylinder deactivation) to further improve fuel economy during cruising conditions. The engine is longitudinally mounted in the chassis. The transmission paired with the L3B is an 8-speed automatic transmission (8L45), known for its smooth shifting and wide gear ratio spread. This transmission is electronically controlled and adapts to driving conditions to optimize performance and fuel efficiency.

Driving Characteristics

The 2.7-liter turbo engine, while not as immediately powerful as the V8 options, provides a surprisingly capable driving experience. The turbocharger provides a noticeable boost in power, particularly in the mid-range, making it suitable for everyday driving and moderate towing. The 8-speed automatic transmission is well-tuned, offering smooth and timely shifts. Compared to the manual transmission options available on other Sierra trims, the automatic prioritizes convenience and ease of use. While the 0-60 mph times aren’t as quick as the V8 models, the 2.7T offers a more than adequate level of performance for most drivers. The gear ratios are optimized for both acceleration and fuel economy, with a relatively tall final drive ratio contributing to lower engine speeds at highway speeds.

Equipment & Trim Levels

The 2.7-liter turbo engine was typically offered on the SLE, Elevation, and AT4 trim levels of the Sierra 1500. Standard equipment generally included features such as an 8-inch touchscreen infotainment system with Apple CarPlay and Android Auto compatibility, a rearview camera, keyless entry, and LED headlights. Higher trim levels, like the AT4, added features such as leather upholstery, heated and ventilated front seats, a premium audio system, and advanced safety technologies like lane departure warning and automatic emergency braking. Optional extras included a larger touchscreen display, a sunroof, and a trailering package.

Chassis & Braking

The Sierra 1500 V utilizes a fully boxed frame for enhanced rigidity and durability. The front suspension consists of independent coil springs, while the rear suspension employs a traditional leaf spring setup. This configuration provides a good balance between ride comfort and load-carrying capacity. Braking duties are handled by ventilated disc brakes on all four wheels, with the front discs measuring 330x30mm and the rear discs measuring 345x20mm. An anti-lock braking system (ABS) is standard. The steering system is a rack-and-pinion setup with electric power steering, providing responsive and precise handling.

Market Reception & Comparison

The 2.7-liter turbo Sierra 1500 received generally positive reviews from automotive critics. It was praised for its fuel efficiency, smooth ride, and surprisingly strong performance. Compared to the V8-powered Sierra models, the 2.7T offered better fuel economy, particularly in city driving. However, some critics noted that it lacked the raw power and towing capacity of the larger engines. Against competitors like the Ford F-150 with its EcoBoost engines and the Ram 1500, the Sierra 2.7T offered a competitive package, particularly for buyers prioritizing fuel efficiency and value.

Legacy

The L3B 2.7-liter turbo engine has proven to be a relatively reliable powertrain. While some early models experienced minor issues with the turbocharger and fuel system, these were largely addressed through software updates and revised components. In the used car market, the 2018-2021 Sierra 1500 with the 2.7-liter turbo engine represents a good value proposition. It offers a compelling combination of capability, comfort, and fuel efficiency at a more affordable price point than the V8 models. Its continued presence in the used market demonstrates its enduring appeal to buyers seeking a practical and versatile full-size pickup truck.