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The UMI on-car adjustable rear upper control arm for 1965–1966 GM B-Body lets you set pinion angle without removing the arm, using a 4140 heat-treated Chromoly adjuster with left and right hand threads. It replaces worn factory uppers to reduce wheel hop and improve cornering and track consistency. Supplied with grease-able Energy Suspension polyurethane bushings, TIG-welded construction, Chromoly tube adapters and a durable powder coat. Sold each.
UMI Performance 65-66 GM B-Body Adjustable Upper Control/Trailing Arm
