Dave,
It seems like the shaft out of the gear box is about 1/16th bigger in diameter than the rag joint. I need to get a set of measuring calipers to make sure, but I took a 13/16th open end wrench and it fit over the shaft. When I took and put he wrench over the opening of the rag joint to compare the size, it looked about a 1/16th smaller than the wrench.
It seems like the shaft out of the gear box is about 1/16th bigger in diameter than the rag joint. I need to get a set of measuring calipers to make sure, but I took a 13/16th open end wrench and it fit over the shaft. When I took and put he wrench over the opening of the rag joint to compare the size, it looked about a 1/16th smaller than the wrench.