I had the exact same thing happen to me and the exact condition you are experiencing after the axle had been replaced. I not only took the car the dealer, they replaced my axle then I noticed the vibration. Then they replaced my driveshaft and still I have a vibration. So I replaced both axles and the driveshaft with DSS parts and still feel the vibration. I drained the diff fluid and saw it looked very dark with only 4800 miles. It seemed better with the new fluid but I still feel it's not right. I think something in the posi got damaged when the axle broke. I'm going to try a new diff and see what happens. If you fix yours first let me know what you found
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