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12_month_wait : So it rotates? Is it connected to the left half-shaft assembly or the right?
The drive axle is what most people erroneously call the differential. It is not suppoed to rotate.
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12_month_wait : For this application, I would see welded construction as a benefit over bolts and nuts. If installed without enough torque or if they work loose, the bolted joints would allow some of the undesired movement to return. Periodic checks to ensure the bolts are tight would be another maintenance item to keep up with. Not saying one design is functionally better than the other.
Welded vs bolted construction is nowhere near as important as the geometry of the mechanism. Unless the installer is incompetent. But an incompetent installer isn't likely to be bolting anything to me car anyway.