Tracing down a high speed vibration 80+ mph, 1st order driveshaft vibration on EVA tool.

Spicer 1350 slip yoke https://www.actionmachineinc.com/products/3-3-3931x?variant=37912097733

Driveshaft is a Dynotech. built to 69 Plymouth B-body length.

With the driveshaft installed in the transmission, the slip yoke can be pushed up and down .025 https://www.youtube.com/watch?v=va73VUAmGes

With the driveshaft removed, the output shaft can be moved .025-.030. https://www.youtube.com/watch?v=GKS-x6wtOkU

Does the output shaft bearing require replacement?

My opinion is that the bushing is shot, but what about the bearing?

Thanks