What are the proceedures for replacing the single center speaker in the dash on a 1966? Don't see it addressed in the shop manual... I can't see the speaker from under the dash so I'm thinking the glove box has to be removed for access.
Unless someone in the past as monkeyed with it in some strange way, you should be able to readily get at it through the grill area on top. The speaker sits down in a hole and is screwed into place. Should be a piece of cake.
Sure, you remove the defrost vent grill. There should be 4 screws holding the speaker in. remove them.
The wires should have a connecter. pull them apart and connect the new speaker wires. Drop the speaker in and replace the screws. Set the defrost vent in place and your good to go.