If its not noisy while driving I wouldn't worry about it. The spider gears/side gears in the carrier have lots of side clearance which becomes part of what you observe with the wheels in the air. Back lash between ring and pinion which would be a wear item and a concern is rather hard to judge from the axle driveshaft coupling due to the above reason.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician