715,
According to the post, you're right, the shaft has a machined area at the end. Now when you read the TSM and Reading on Autozone"s website, they ask if it is a low stall or a high stall. The TSM says there was a label put on at the factory to identify, if the label is gone you're sol as to which one was in the vehicle. So which do you get a low stall or high stall. My thought is to go with the low stall.
Eddie