Just a point - it is not the IRD that causes tyre wear - it is a failed VC that causes the tyre issues because of transmission windup. Likewise it is the failed VC that causes the IRD to fail. It is the gearing of the IRD that causes the VC to fail - a somewhat circular process.
So if the VC is good - it is unlikely the bearing noise is coming from then iRD.
The noise could be coming from anywhere - I would check - wheel bearings, UJs and VC bearings first - then look for the hard stuff - though unlikey the CV on the propshaft may be an issue.
Garry
REMLR 243
2007 Range Rover Sport TDV6
1977 FC 101
1976 Jaguar XJ12C
1973 Haflinger AP700
1971 Jaguar V12 E-Type Series 3 Roadster
1957 Series 1 88"
1957 Series 1 88" Station Wagon
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