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UMI's P/N 403133 tubular a‑arm kit modernizes 1964–1972 GM A‑Body handling by replacing stamped arms with high‑strength tubular uppers and lowers. Upper arms use UMI‑made Delrin bushings and billet CrMo cross shafts; lowers feature greaseable polyurethane bushings and spring isolators. Jig‑built for fit, TIG‑welded for strength and finished in red or black powder coat, the kit ships assembled with alignment specs and detailed instructions.
UMI Performance 64-72 GM A-Body Tubular Upper & Lower Front A-Arm Kit
