2007-2010 GMC Sierra 3500HD III (GMT900) Crew Cab Long Box 6.0 V8 (360 Hp) 4WD DRW Automatic

The GMC Sierra 3500HD III, produced between 2007 and 2010, represents the third generation of the Sierra 3500HD heavy-duty pickup truck (GMT900 platform). This iteration focused on increased capability, refined interiors, and improved ride quality compared to its predecessors. The Crew Cab Long Box configuration, paired with the 6.0-liter Vortec V8 engine producing 360 horsepower and a four-wheel-drive dual rear wheel (DRW) setup with an automatic transmission, was positioned as a workhorse for demanding tasks like towing and hauling. It catered to buyers needing substantial payload and towing capacity without sacrificing passenger space and comfort.

Technical Specifications

INTRODUCTION

The 2007-2010 GMC Sierra 3500HD Crew Cab Long Box equipped with the 6.0-liter V8 and automatic transmission was a significant offering in the heavy-duty truck segment. Built on the GMT900 platform, it represented GMC’s attempt to blend robust capability with a more refined ownership experience. This particular configuration aimed at buyers who frequently towed large trailers, hauled heavy loads, and required the space and comfort of a crew cab. The DRW (Dual Rear Wheel) setup further enhanced stability and payload capacity, making it a popular choice for commercial users and serious enthusiasts.

Powertrain & Engine Architecture

At the heart of this Sierra 3500HD lies the Vortec LY6 6.0-liter V8 engine. This engine is a member of the Vortec family, known for its robust construction and relatively simple design. It features a cast iron block and aluminum cylinder heads. The LY6 utilizes a multi-port fuel injection system, delivering fuel directly to each cylinder for efficient combustion. The overhead valve (OHV) valvetrain, while not as technologically advanced as overhead cam designs, is known for its durability and ease of maintenance. The engine produces 360 horsepower at 5400 rpm and 515 lb-ft of torque at 4200 rpm. The Hydra-Matic 6-speed automatic transmission was the sole transmission option for this configuration. This transmission was chosen for its ability to handle the engine’s torque output and provide smooth, reliable shifting under heavy loads. The transmission’s gear ratios were optimized for both towing and everyday driving, offering a balance between power and fuel efficiency.

Driving Characteristics

The 6.0-liter V8 and 6-speed automatic combination delivered a capable, if not exhilarating, driving experience. While not as quick as some of the diesel-powered competitors, the LY6 provided ample power for most towing and hauling scenarios. The automatic transmission shifted smoothly and predictably, making it easy to manage the truck’s weight. The DRW setup significantly improved stability, especially when towing, reducing sway and providing a more confident feel. However, the added weight of the DRW also impacted ride quality, making it firmer than standard single-rear-wheel configurations. The gear ratios were well-suited for towing, providing strong low-end torque, but could feel slightly tall for quick acceleration. Compared to the available Duramax diesel engine, this gasoline V8 offered less torque and lower fuel economy, but a lower initial purchase price and potentially lower maintenance costs.

Equipment & Trim Levels

The Sierra 3500HD Crew Cab Long Box with the 6.0-liter V8 typically came standard with features like air conditioning, power windows and locks, and a basic audio system. The Crew Cab configuration offered spacious seating for five passengers, with ample legroom and headroom. Higher trim levels, such as the SLT and Denali, added features like leather upholstery, heated seats, a premium audio system, and chrome exterior trim. Optional extras included a navigation system, a sunroof, and various towing packages. The interior design was functional and durable, with a focus on practicality rather than luxury.

Chassis & Braking

The Sierra 3500HD’s chassis was designed for heavy-duty use. It featured a fully boxed frame for increased rigidity and strength. The front suspension utilized an independent torsion bar setup with double wishbones, providing a comfortable ride and good handling. The rear suspension employed a traditional leaf spring design, which was well-suited for carrying heavy loads. Braking duties were handled by ventilated disc brakes on all four wheels, providing ample stopping power. An Anti-lock Braking System (ABS) was standard, enhancing safety and control during emergency braking situations. The DRW configuration provided a wider track width, further improving stability and handling.

Market Reception & Comparison

The GMC Sierra 3500HD with the 6.0-liter V8 received generally positive reviews. Critics praised its robust construction, ample power, and comfortable interior. However, it was often criticized for its lower fuel economy compared to diesel-powered competitors. The gasoline V8 was seen as a good option for buyers who didn’t require the extreme towing capacity of a diesel and preferred a lower initial purchase price. Compared to the Duramax diesel, the 6.0-liter V8 offered a simpler and potentially less expensive maintenance experience, but lacked the diesel’s superior torque and fuel efficiency. The Ford Super Duty and Ram 3500 were the primary competitors in this segment, each offering similar capabilities and features.

Legacy

The 2007-2010 GMC Sierra 3500HD with the 6.0-liter V8 and automatic transmission remains a popular choice in the used truck market. The Vortec LY6 engine is known for its reliability and durability, although it is susceptible to oil consumption issues in some cases. The Hydra-Matic transmission is also generally reliable, but requires regular maintenance to ensure smooth operation. These trucks are often sought after by buyers who need a capable and affordable heavy-duty pickup for work or recreational purposes. While not as fuel-efficient as modern trucks, the GMT900 Sierra 3500HD continues to offer a compelling combination of capability, comfort, and value.