the driveshafts are marked from the factory, one is a triangle with its other husband mark - you have to align both. There are heavier nuts available from MB to counter a vibration problem, They even have a solid rubber block that is bolted to the diff mounts in case of extremes.

Usually its best to do the easy stuff first. I also read somewhere that the carrier bearing can be shimmed to make up for lost alignment of the driveshaft. Another point to see is the driveshaft bushings on either end.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)