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QA1 Rear Coilover Conversion Kit - Double Adjustable, Soft Ride, 170 lbs/in Rate - 1975-1986 Chevrolet C10, GM 12 Bolt IS-F 1999 BMW 7 Series 740iWith this all new, engineered from scratch rear system, 1975 1986 Chevrolet C10 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