put in 8 3/4, now have vibration

Powerflite said

Also, I am not certain, but it looks like your yoke is made for the big joint. Take the joint out from the driveshaft and try fitting the larger end into the yoke. If it fits well, you should use a standard 7290 (big) joint. I think that is all it could be as the 1350 stuff uses U-bolts instead of straps.

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u bolts instead of straps? I thnk I'm gonna have to check online for pics so I can understand.

The one I put in does not have a larger or smaller end. It was square (same dimensions every way).

But I'm hoping you may be onto something. I have a "big to small" u-joint that I used on a different a-body 15 years ago. Maybe I will try and fit the big end of that one into the yoke. I notice the yoke, where it receives the cups, is kinda cupped out itsself... like the edges are higher (maybe I should file?) and middle worn down. Maybe I'm using the wrong straps...