The gear drives have the fill plug in a different spot, so if you put one on a hydro, your fluid level would be too low. I have never heard of any having a drain in the rear cover, but I think the gear drives, at least some of them, had a drain in bottom of the trans casting. That’s probably what you are thinking about. As far as adding a sight glass, I think that would be more work than it’s worth. Just pop the fill plug out, if fluid runs out your good. If it doesn’t, add some until it does. I agree with George, better to just take the cover off and clean it out.
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125, 126, 147, 129, 149 x 2, 1450, 882, 1810, 1320, 1440, 2135, 2 129’s for parts/project, 1950 Farmall Cub
38" LT mower deck, 4 42" triangle mower decks, 2 44A mower decks, 2 50C mower decks, 42” GT deck, 3 42" snow/dirt blades, 42" landscape rake, #4 cart
     
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