My Garage ..LOL - just Kidding .
After Topping Up the Rear - Gear , I Drained it and Flushed it some - Lighter Oil 30W - till it came out
Much Cleaner , then Flushed with Fresh 80W90 - to Clear thew 30W - then Topped it up Full this Time . .
Tried to Count the Vibrations - Compared to Second - leaning toward 10X
Fast Vibration around @ 42 Mph - it feels like it's going 5X - 10X - The Wheels ..
I should Test a New U-Joint , also .. Link show Movement & Sound .
https://youtu.be/q-nLTHzsv8c