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The introduction of steel frames revolutionized the automotive industry, offering improved strength and safety. As cars became faster and more sophisticated, so too did their chassis. The 1950s and 1960s heralded the era of performance cars, which required advanced chassis designs to handle increased power and speed. Innovations in suspension systems allowed for better handling and ride quality, raising the bar for what consumers expected from their vehicles.
a car chassis

In contrast, unibody construction integrates the frame and body into a single unit. This design is commonly found in sedans, crossovers, and many modern vehicles. The unibody structure typically provides better fuel efficiency and handling characteristics due to its lighter weight and improved rigidity. However, repairing a unibody vehicle may be more complicated, as damage to the body can compromise the frame's integrity.
frame chassis
