This is a wild guess, as I've never had the experience of driving a manual trans Galant, but it sounds similar to a chirp I was getting at idle in my old G, when the engine was cold and in gear, I would hear a constant chirping like that, I was thinking maybe motor mounts. Mine were shot to hell however, and I don't know if solid mounts do that, but that's my suggestion. Hope it helps and good luck!
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