There is no Alpha III.
Before "Alpha" there was MC-1.
Another way to tell Gen 1 or Gen 2 apart is to take a photo from the side.
Gen 2 has the...
Ha. I never knew Gen 1 drives had a dip stick on the cap. Mine had so much paint on it you couldn't see it!
Not worth changing the gear ratio of your Alpha. Go directly to a bravo.