The Birth of the Square Body

As GMC’s square body trucks entered production in the 1950s, they were met with a unique design that set them apart from other vehicles on the market. The initial designs featured a boxy shape with sharp angles, giving rise to their iconic “square body” moniker.

One of the key features that made these trucks stand out was their bold and angular exterior styling. The square lines and rectangular shapes gave the truck a rugged and utilitarian appearance that resonated with farmers, construction workers, and other individuals who relied on their vehicles for heavy-duty work. The boxy shape also provided an abundance of interior space, allowing for ample storage and cargo capacity.

Another notable feature was the introduction of **chrome accents** on the exterior trim, which added a touch of elegance to an otherwise utilitarian design. These chrome accents would become a signature element of GMC’s square body trucks, distinguishing them from other vehicles in their class.

As production continued throughout the 1950s and 1960s, subtle updates were made to the design, including new grille treatments, altered headlamp designs, and fresh color schemes. These changes helped keep the truck fresh and modern while still maintaining its rugged charm.

Design Evolution

As the square body trucks continued to evolve, the exterior and interior styling underwent significant changes. The 1967 model year saw the introduction of new chrome trim on the grille, door handles, and tailgate, giving the truck a more refined appearance. The following year, GMC introduced a new wheel design with a larger diameter and thinner spokes, further enhancing the truck’s visual appeal.

Inside, the square body trucks received updates such as a redesigned dashboard with a more modern look, as well as improved instrumentation including a large speedometer and tachometer. The introduction of optional amenities like power steering and brakes in 1969 further increased the truck’s appeal to consumers.

These design changes not only updated the aesthetic of the square body trucks but also had an impact on their performance. The new wheel design, for example, improved traction and handling, while the modern dashboard and instrumentation provided a more comfortable and convenient driving experience. Additionally, the availability of optional amenities like power steering and brakes made the truck more appealing to consumers who valued convenience and ease of use.

Some notable changes included:

  • 1967: Chrome trim added to grille, door handles, and tailgate
  • 1968: New wheel design introduced with larger diameter and thinner spokes
  • 1969: Power steering and brakes become optional amenities

Engine Options and Performance

The engine options available for GMC’s square body trucks played a crucial role in defining their power and fuel efficiency. The most common configuration was the V8 engine, which provided ample power for hauling heavy loads and towing large trailers. The 4.3L V8 engine, introduced in the early years of production, produced 150 horsepower and 275 lb-ft of torque. This engine was paired with a three-speed automatic transmission and delivered decent fuel economy for its time.

In contrast, the inline-six engine option offered more refined performance and better fuel efficiency. The 6.2L inline-six engine, introduced in the mid-1970s, produced 150 horsepower and 250 lb-ft of torque. This engine was paired with a four-speed automatic transmission and provided a smooth power delivery.

  • Key Benefits of V8 Engine:

    • Ample power for hauling heavy loads and towing large trailers
    • Smooth acceleration and responsive throttle response
    • Suitable for those who prioritize performance over fuel efficiency

  • Key Benefits of Inline-Six Engine:

    • Better fuel economy compared to the V8 engine
    • More refined power delivery and smoother acceleration
    • Suitable for those who prioritize fuel efficiency over performance

Special Editions and Variants

The special edition and variant models of GMC’s square body trucks offered unique styling cues and features that set them apart from their standard counterparts. One such model was the Sierra, which featured a more aggressive exterior design, including a distinctive grille and wheel trim. The interior boasted premium materials, including leather upholstery and wood accents.

Another notable variant was the High Sierra, which catered to those seeking a more luxurious truck experience. It came equipped with amenities like power windows, cruise control, and a premium audio system. Additionally, the High Sierra featured exclusive exterior badging and unique wheel designs.

The Sierra Grande was another special edition model that offered a bold, sporty appearance. Its exterior was distinguished by its bright chrome accents and distinctive stripes. Inside, it boasted features such as a sport steering wheel and premium trim.

These special edition and variant models not only offered unique styling but also provided customers with additional features and options to suit their needs. They were an integral part of GMC’s square body truck lineup, offering something for everyone.

Legacy and Collectibility

The enduring popularity of GMC’s square body trucks can be attributed to a combination of factors that contribute to their collectibility and value as vintage vehicles. One key aspect is their nostalgic appeal, evoking memories of rural America and the American Dream. The rugged, dependable, and simple design of these trucks resonates with many enthusiasts who grew up with them or appreciate their nostalgic charm.

Another factor is the scarcity of these models on the market. As production ceased in the late 1980s, the supply of square body trucks has dwindled, making them increasingly rare and valuable. This rarity has driven up demand, particularly among collectors and enthusiasts seeking to own a piece of automotive history.

  • Condition: The condition of the truck is crucial in determining its value. Well-maintained models with original paint, interior, and mechanical components are highly sought after.
  • Rarity: The fewer units produced, the higher the value. Limited edition models or those with unique features, such as special trim or engine options, command a premium price.
  • Restoration potential: Trucks that can be restored to their former glory are more valuable than those in need of extensive repairs or reconstruction.
  • Provenance: Trucks with documented histories, such as previous owners or racing heritage, can significantly increase their value.

In conclusion, GMC’s square body trucks are more than just a nostalgic relic of the past - they’re a testament to the company’s commitment to quality and innovation. From their rugged design to their reliable performance, these trucks have earned a special place in the hearts of many truck enthusiasts. Whether you’re a seasoned collector or simply a fan of classic vehicles, GMC’s square body trucks are an iconic part of American automotive history that deserves to be celebrated.