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UMI Roto-Joint adjustable rear upper control arms for 1973–1977 A-Body and 1978–1988 G-Body applications offer easy on-car pinion angle tuning with a CrMo adjuster and greaseable spherical Roto-Joints. Built with 1/4" CNC laser-cut mounting pads and mixed TIG/MIG welding, these arms reduce suspension deflection and wheel hop while remaining durable enough for street, strip or pro-touring use and install in roughly 1–2 hours.
UMI Performance 73-77 GM A-Body 78-88 G-Body Rear Upper Control Arms Adjustable
