I looked for parts diagrams for your model. It appears that two different gear boxes were used over the years. Neither looks like your picture. One of the gear boxes in the diagrams had a vent while the other didn't.
Are there any identifying marks or numbers on your gearbox?
The vent would have to be above oil level. The one AT2572 gearbox shown on the diagrams had a vent on one the two bolt holes on the PTO connection end of the gearbox.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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