[LostMy65]

Alright, so I used the phone app. I laid it across the carburetor and got 2.2 degrees. Slapped it against the rear axle and got 2.2 degrees. Well, actually I used the setting in the app to rotate the angle finder 90 degrees so I could get the perpendicular angle.
The flat section of the axle where the cover mounts is perfectly perpendicular to the top of the carburetor.
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Next I used a technique I found on the Internet to check if your driveline is out of balance. You jack the back wheels off the ground, start it, put it in gear, and Rev it up until you feel the vibration. Then while it's at that rpm, take a marker taped to a stick and slowly raise the marker until it barely ticks the driveline. Do it at both ends and the middle. Well, I'm pretty sure I found where the vibration is occurring. It's up by the yoke. I did a few marks up at the front and they all hit in the same place. So I shut it down and crawled underneath to inspect. While turning the driveline by hand, I noticed some slop where the yoke slips inside the transmission.
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Now my question is:
Should the yoke be snug in the transmission?
I'm guessing it should. I think the next thing I'm going to check is find another yoke and see if it has the same slop to it.
Any other ideas or suggestions?