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The UMI on-car adjustable rear upper control arm for 1967–1970 GM B-Body offers on-vehicle pinion angle adjustment via a 4140 heat-treated Chromoly adjuster, eliminating the need to remove the arm for setup. It’s a direct replacement that minimizes wheel hop and sharpens cornering and track consistency. Supplied with grease-able polyurethane bushings, TIG-welded construction, Chromoly tube adapters and a durable powder coat. Sold individually.
UMI Performance 67-70 GM B-Body Adjustable Upper Control/Trailing Arm
