Stop in for a cup of coffee

Princess Valiant said
Now I'm real interested to open it up and see what's in there. When I bought it, I was told it was an od and I paid OD prices.

Its my fault I didn't inspect it closer because the guy I bought it from, delivered it and set it on the shelf for me so I got lazy and didn't really look it over and took his word for it.
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Why do you have to open it? Put it in high gear. Rotate the input shaft one full revolution. If the output shaft matches, it's a non OD. If the output shaft turns more than one full revolution, it's an OD. It'll help to put chalk marks on it so you can see it good.