Still struggling with my vibration. Put it up on stands today and found this. Driveshaft has some up and down motion. Not sure if it is the shaft or the axle. Axle was used, driveshaft got shortened when it was all installed.
Emailed the company that shortened the shaft and will see what they say.
Can't figure out how to embed the video, but here is a link:
https://youtu.be/hykrsMDBKdg