‘66 Barracuda- odometer works, speedometer does not

If odometer is clocking but not speedometer, then its internally broken. A speedometer rebuild shop can repair it, or see if somebody has a used replacement you can just swap in.

Yeah, that’s kind of what I was thinking. Guess no harm in taking it out and seeing if it’s something I can fix myself and if not, swapping in a replacement. Thanks for the reply!