1965 Dodge Dart Charger

3-year/32,000-mile lubrication intervals were new big news for '62. Greasable front-end parts came with plugs instead of Zerk fittings, which were to be replaced with Zerk fittings when it came time for a grease job. Then, per factory instructions, the plugs were to be reinstalled. Presumably the idea was to prevent the possibility of contamination through a Zerk fitting. Sometime between '62 and '66, the interval was changed to 3 years or 36,000 miles. The '66 FSM says (emphasis theirs):

"Remove threaded plug from each ball joint and temporarily install lubrication fittings. Inject lubricant until it flows freely from seal bleed area at the base of the seal. Stop when seal begins to balloon. Remove fittings and reinstall threaded plugs."

I think most people just left the fittings. I doubt if even most dealers reinstalled the plugs.