We use UHMW material in all our suspension bushings. It is a self-lubricating Polyethylene that has almost zero deflection yet also absorbs some vibration. It will outlast other types of rubber or urethane bushings. We CNC machine them to the correct tolerances for a smooth hassle free install. With our solid diff bushings, you won't have to worry about any more rubbery flex in your diff mounts during hard acceleration.