UMI polyurethane rear end housing bushings replace worn OEM rubber on 1964 GM applications to boost ride quality and handling. Each set includes two upper control arm rear end differential bushings and is suitable for both street and track use. The polyurethane design reduces deflection versus aged rubber, restoring more predictable rear-end behavior without altering outer metal shells.
UMI Performance 64 GM Polyurethane Rear End Housing Replacement Bushings