A lot of drive line vibration problems are phasing related. If you go back and search, most folks who have had to maintain their driveshafts have been very surprised by how out of phase the driveshafts are!
An out of phase driveshaft will vibrate and eventually destroy transmissions and diffs! Scary!
I had to replace my driveshaft (I have a ‘21 max) and I chose the sand craft driveshaft with carrier bearing. Sand craft puts a notch so you can’t assemble the shaft out of phase even if you tried!
My bearing is butta smooth baby!
So as a PSA, if you are getting vibrations or are in the driveshaft area, check for correct phasing! My cousins down in Mexico have been known to NOT phase correctly from the factory.