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Hi my name is Robert.....
I would get this in writing and make sure it would be covered under warranty in the future. IF the drive-line was not balanced then you would have vibration and normally that is an easy fix. If the unit is not making any vibration now I would not be to concerned about it. I might request a sample of the rear differential to be taken, many times if there is an issue with that certain metals will show up in the fluid. The plug normally has a magnet on it and will catch any metal, if you had chunks of metal on the plug it would be a concern, shavings are fine. IF it appears to be driving good now I would not be to worried and make sure they document the repair for any future warranty issues on it....... Hope this helps some.... Robert
Was just checking in to see if my answer helped? IF you have more questions or concerns please feel free to contact me... Robert