Abstract: A three diameter hinge pin for a vehicle door hinge assembly including a door bracket and a body pillar bracket. The three diameters include successive large upper diameter, small lower diameter, and an intermediate diameter, wherein the latter diameter permits the hinge pin to drop further downwardly through two openings in the upper legs of two hinge brackets, wherein the openings must closely approximate the pin's large upper diameter, thereby allowing the lower end of the pin to enter the opening in the lower legs of the two brackets, rather than being positioned somewhere above the opening.