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UMI rear lift bar set for 1964–1972 GM A‑body vehicles replaces the factory rear control arms to add traction without changing ride height, using axle torque to load the chassis for harder launches and reduced wheel hop. Constructed from boxed mild steel tubing with greaseable polyurethane bushings and TIG‑reinforced sway bar sleeves. P/N 4020 is a weld‑in kit; mounting brackets arrive bare for welding and the rear brackets offer three settings to alter instant center and correct geometry on lowered cars. Hardware and instructions included.
UMI Performance 64-72 GM A-Body Rear Lift Bar Set-Up-Weld-In
