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Double check the carrier bearing alignment. It needs to be at 90º to
the shaft centerline. Also look at the rubber webbing in the bearing support.
While your there you can also push on the trans mount to see if it has excessive
movement in it. If you find all that checks out I have a PDF that shows hoe to
check the driveshaft of out of balance. Got some PDFs that you might find of help
in the driveling area. 1d had the balance testing steps. I added the rest incase you
are up late at night and want to go back to sleep. But they do have some
info on other reasons for vibrations from the driveline.