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QA1 Rear Coilover Conversion Kit - Single Adjustable, Soft Ride, 170 lbs/in Rate - 1973-1974 Chevrolet C10 Pickup, GM 12 Bolt Millenia 2011 Dodge Charger RT Max/PlusWith this all new, engineered from scratch rear system, 1973 1974 Chevrolet C10 Pickup owners can add modern performance to a pickup that was designed for utility all without removing the bed of the truck. QA1 engineered a unique bolt in torque arm design that maximizes performance without the inherent binding issues of other 4 link systems. This provides superior control over suspension movement, resulting in a smooth ride and great handling