The Chevrolet Suburban, America’s longest-running nameplate, boasts a rich history spanning nearly nine decades. While today’s Suburban is known as a luxurious and capable SUV, its roots lie in rugged utility. The seventh-generation Suburban, produced from 1973 to 1991, and often referred to as the “Squarebody Suburban,” perfectly embodies this transition, blending practicality with passenger comfort. This era solidified the Suburban’s iconic status and remains surprisingly attainable for classic car enthusiasts today.
1991 Chevrolet Suburban. Image courtesy of GM.
The Squarebody Suburban: A Revolution in Design and Functionality
The 1973 redesign marked a significant turning point for the Suburban. The introduction of a four-door body style revolutionized passenger access, while a quieter and more comfortable interior elevated the riding experience. This generation maintained the Suburban’s ample cargo space and impressive towing capacity, making it a viable alternative to the traditional station wagon. The squarebody Suburban ultimately outlived and outsold the station wagon, establishing its dominance in the American automotive market.
Power and Performance: Under the Hood of a Legend
Following the naming convention of its pickup truck counterparts, the squarebody Suburban utilized the C/K system, with “C” designating two-wheel drive and “K” signifying four-wheel drive. Both ½-ton and ¾-ton configurations were available. Engine options mirrored those of its pickup siblings, ranging from a base six-cylinder (offered until 1976) to a variety of small-block V-8s, including the 305, 307, the ubiquitous 350, and the 400 in 4WD models. The 2WD versions offered the powerful 454 big-block, and a 6.2-liter diesel option became available in 1982.
1977 Chevrolet Suburban engine. Image courtesy of Brad Phillips.
Distinguishing Features of the Squarebody Era
While the term “squarebody” broadly describes this generation, subtle styling variations differentiate models throughout its production run. Early models (1973-1980) featured round headlights, a distinctive hood, and vertical side marker lights. In 1981, the design shifted to rectangular headlights, a flatter hood, and horizontal side marker lights. A final update in 1989 introduced four smaller rectangular headlights. Three primary trim levels were available: the basic Sierra/Custom, the mid-level Sierra Classic/Custom Deluxe/Scottsdale, and the luxurious Sierra Grande/Silverado, boasting enhanced sound insulation, power features, and front and rear heating and air conditioning.
1974 Chevy Suburban. Image courtesy of GM.
Owning a Squarebody Suburban: Maintenance and Modifications
Maintaining a squarebody Suburban today is similar to owning its pickup truck brethren. Parts are readily available, and the robust small-block Chevy engine is renowned for its reliability. The drivetrain, featuring the TH350 transmission in earlier models and the 700R4 overdrive in later versions, is equally durable. ¾-ton models boasted the heavy-duty TH400 transmission. Axles, ranging from the 10-bolt to the 14-bolt full-floater, are sturdy and easily serviceable. However, rust can be a concern, particularly in earlier models. Rocker panels, floorboards, and wheel wells are common rust-prone areas. Interior components are generally durable, although dash cracks are prevalent. Modifications are less common on Suburbans compared to pickups, but similar considerations apply. Lift kits with larger tires on 4×4 models necessitate frame reinforcement to prevent cracking.
1990 Chevrolet Suburban rear three-quarter view. Image courtesy of GM.
Affordability and Market Appeal
Despite the surge in classic truck and SUV prices, the squarebody Suburban remains relatively affordable. Usable examples can be found for under $10,000, while excellent condition models typically range from $25,000 to $30,000. Notably, Suburbans are popular among younger buyers, particularly millennials, likely due to their affordability compared to other classic SUVs like the Blazer.
1991 Chevy Suburban. Image courtesy of GM.
The Squarebody Suburban: A Timeless Classic
The seventh-generation Suburban represents a significant chapter in automotive history. Its blend of style, utility, capability, and comfort, combined with its relative affordability, continues to attract enthusiasts across generations. The squarebody Suburban stands as a testament to enduring design and lasting appeal.
