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Hi all,

This is my first post so go easy on me!

I have a 2000 v70 that was having a whirring sound for the last year or so. Mechanic thought it was the viscous coupler, so we replaced it. This didn’t solve the issue. My mechanic installed a gently used rear differential yesterday. Whirring noise is gone and it generally feels better. However, now whenever I hit 38-49 mph there is a moderate shaking from underneath the car. I strong vibration that sticks around until I hit 50mph.

Any idea what could be causing this? I had no vibrating before the switch happened. They suggested I drive it for a week and see if things settle into place.

Tires replaced about 6,000 miles ago and in good shape.

They suggested that I might need a new driveline which I am hesitant to jump into. Any thought or suggestions would be greatly appreciated.
 
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