@scottydoggs I would consider it a shuddering feel. I haven't noticed any slip to my knowledge.

@Rob97gtp "If your vibration is under acceleration and goes away when off acceleration at the same speed you need axles..." - this is exactly how the vibration is felt. Only under acceleration to maintain set cruise speed or to accelerate in general. It's getting to the point where I do not dare to take it past 65 mph. "There is no way to tell by looking at them unless boot is torn a slinging grease that they are bad when there is a vibration under acceleration" The boots are still in good shape. No oil slinging or dripping.