Diff gear oil can be drained a portion saved and sent in for analysis to see if any wear metals are indicating a failure.
Since you had your rear axle changed about 15K ago, check rear lug nut bolts, not to tight?
From front of car: check motor mounts, front flex disc, mid driveshaft bearing?, rear flex disc, rear diff mounts - is the noise more noticeable with rear passengers in car?
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