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UMI 12-bolt swap adjustable upper control arms are designed to fit a 1964–1972 A-Body 10- or 12-bolt rear end into a 1978–1988 G-Body chassis, correcting geometry and preventing rear-end bind. Supplied adjustable with 4140 chromoly threaded tube adaptors and a heat-treated 4140 chromoly adjuster, they feature spherical Roto-Joints, TIG-welded construction and CNC-machined mounting plates. Shipped assembled and ready to install.
UMI Performance 78-88 GM G-Body 12-Bolt Swap Adjustable Upper Control Arms- Roto-Joints
