Worn out yolk?

I should have mentioned this is the trany yoke ...904 Torqueflite.

The vibration is a slight pulsating one around 3400+ rpm. I have had the driveline balanced and pinion angle checked/corrected by the drivleine shop . Installed a new tailshaft bushing etc... when I grab the front ujoint/yoke it seems to have excess play in it .