2007-2010 Chevrolet Silverado 2500 HD II (GMT900) Extended Cab Long Box 6.0 V8 (360 Hp) Automatic

The Chevrolet Silverado 2500 HD II, specifically the Extended Cab Long Box configuration with the 6.0-liter V8 engine and automatic transmission, was a mainstay of Chevrolet’s heavy-duty truck lineup from 2007 to 2010. Representing the second generation of the GMT900 series, this variant occupied a sweet spot for buyers needing substantial towing and hauling capacity without opting for the more expensive and specialized diesel-powered models. It was positioned as a workhorse, appealing to contractors, farmers, and individuals requiring a robust pickup for both professional and personal use. This particular configuration balanced power, capability, and relative affordability within the Silverado 2500 HD range.

Technical Specifications

INTRODUCTION

The Chevrolet Silverado 2500 HD II (GMT900) Extended Cab Long Box 6.0 V8 Automatic, produced between 2007 and 2010, represented a significant evolution in Chevrolet’s heavy-duty truck offerings. Built on the GMT900 platform, this generation aimed to provide increased capability, improved refinement, and enhanced safety features compared to its predecessor. The Extended Cab configuration offered a compromise between the standard cab’s affordability and the crew cab’s passenger space, while the long box provided ample cargo capacity. The 6.0-liter Vortec LY6 V8 engine, paired with the Hydra-Matic 6-speed automatic transmission, was a popular choice for buyers who prioritized gasoline power and a smooth driving experience over the higher fuel economy and torque of the Duramax diesel option.

Powertrain & Engine Architecture

At the heart of this Silverado 2500 HD variant lies the Vortec LY6 6.0-liter (364.13 cubic inches) V8 engine. This engine is a member of Chevrolet’s Vortec family, known for its robust construction and reliable performance. The LY6 features a cast iron block and aluminum cylinder heads, contributing to its durability. It utilizes a multi-port fuel injection system for precise fuel delivery and a traditional overhead valve (OHV) valvetrain. The engine produces 360 horsepower at 5400 rpm and 515 Nm (379.84 lb-ft) of torque at 4200 rpm. The Hydra-Matic 6L80E six-speed automatic transmission was the standard pairing for this engine. This transmission offered smoother shifts and improved fuel efficiency compared to older 4-speed automatics. The 6L80E features electronically controlled shifting and overdrive capabilities, optimizing performance and fuel economy for both highway cruising and heavy towing.

Driving Characteristics

The 6.0-liter V8 and 6-speed automatic combination delivered a capable, though not exceptionally quick, driving experience. Acceleration was adequate for everyday driving and even for towing moderate loads. However, it lacked the low-end grunt of the Duramax diesel. The automatic transmission’s gear ratios were well-suited for hauling, providing sufficient torque multiplication for starting and maintaining speed with a trailer. The ride quality, while typical for a heavy-duty truck, was reasonably comfortable, especially when unladen. Compared to the manual transmission versions, the automatic offered greater convenience, particularly in stop-and-go traffic. However, the manual transmission provided more direct control and potentially slightly better fuel economy. The overall driving experience was geared towards functionality and durability rather than sporty handling.

Equipment & Trim Levels

The Silverado 2500 HD II Extended Cab Long Box 6.0 V8 Automatic typically came standard with features such as air conditioning, power windows and locks, an AM/FM stereo with CD player, and a basic cloth interior. The Extended Cab provided a small rear seat suitable for occasional passengers. Trim levels varied, with the WT (Work Truck), LT, and LTZ being the most common. The LT trim added features like chrome exterior trim, upgraded interior materials, and a better sound system. The LTZ trim offered premium features such as leather upholstery, heated seats, and a Bose audio system. Optional extras included a navigation system, sunroof, and various towing packages.

Chassis & Braking

The Silverado 2500 HD II featured a robust chassis designed to handle heavy loads. The front suspension utilized an independent torsion bar setup with double wishbone components, providing a comfortable ride and good handling. The rear suspension employed a traditional leaf spring rigid axle configuration, optimized for load-carrying capacity. Braking duties were handled by ventilated disc brakes on all four wheels, with ABS (Anti-lock Braking System) as standard equipment. The front brakes measured 325×38 mm, while the rear brakes were 325×30 mm. The steering system was a cone worm with recirculation balls, providing a solid and predictable feel.

Market Reception & Comparison

The Silverado 2500 HD II 6.0 V8 Automatic received generally positive reviews. Critics praised its robust construction, ample towing capacity, and comfortable ride. However, some noted that the gasoline engine’s fuel economy was significantly lower than that of the Duramax diesel. Compared to the 6.6-liter Duramax diesel, the 6.0-liter V8 offered less torque and lower fuel efficiency but was considerably less expensive to purchase and maintain. The 6.0-liter engine was also seen as more reliable than the earlier 8.1-liter big-block V8, which had a reputation for oil consumption issues. The 6.0L/Automatic combination appealed to buyers who didn’t require the ultimate towing capacity of the diesel but still needed a capable and reliable heavy-duty truck.

Legacy

The Chevrolet Silverado 2500 HD II 6.0 V8 Automatic remains a popular choice in the used truck market today. The Vortec LY6 engine is known for its durability and relatively simple maintenance requirements. While not as fuel-efficient as modern trucks, it offers a good balance of power, capability, and affordability. Common maintenance items include regular oil changes, spark plug replacements, and occasional attention to the cooling system. These trucks are often sought after by individuals and businesses who need a reliable workhorse without the complexity and cost of newer, more technologically advanced vehicles. The GMT900 platform proved to be a solid foundation, and the 6.0-liter V8 continues to be a respected engine among truck enthusiasts.