The rear lower StrongArms are a direct replacement for the stock lower trailing arms for 1978-1988 GM G Body cars. RideTech StrongArm tubular control arms are designed to stiffen up your vehicle’s chassis, while providing a smoother ride. They feature a tubular design that offers maximum strength. Therear UpperStrongArms are a direct replacement for the stock trailing arms for 1978-1988 GM G Body cars. Theyutilize R-Joint technologyandprovide added strength to help get the power to the pavement.R-Joints are a revolutionary rod end design that provides low friction,full range articulation, long service life, lateral stability and quiet operation.