In 1966, the Chrysler 300 letter series was discontinued, the 440 V8 replaced the 413 V8, and there was a mild facelift.
1967 brought makeovers which changed front and rear styling extensively. The 4-door sedan was dropped from lineup (leaving the 4-door hardtop), the 440 V8 became standard and only available powerplant in two guises: base and more powerful TNT. 1968 facelifting brought concealed headlamps which were to be 300 trademark until 1971.