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QA1 Rear Coilover Conversion Kit - Single Adjustable, Firm Ride, 250 lbs/in Rate - 1973-1986 Chevrolet C10 Suburban, GM 12 Bolt Innova The KSport Airtech Executive AirWith this all new, engineered from scratch rear system, 1973 1986 Chevrolet C10 Suburban 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