1,Jinan Dunmu Rod End 2,Rod end 3,ball joint 4,Spherical Bearing 5, ... in most linkage systems for motion control applications, and should not be confused with spherical rod end bearings, which are a ... different design.Sealed ball joints do not require lubrication as they are "lubed for ... and eventually turns into a squeaking sound at the end of a stop, when the gas pedal is ...