>> it occurs that that noise hunting might be better up on blocks and in drive at some speed.
Yes, that's the sort of test I would do before stripping anything down - listening with a stethoscope is a good way to pinpoint the bearing at fault. There will be four bearings within the central diff housing, and, I imagine, a fairly large double row bearing behind each hub (I would be surprised to find a pair of taper roller bearings in the hubs, but, ...)
If it's the diff - To remove the diff out of the front of the axle, you'll first need to withdraw the half shafts. You probably won't need to take them right out, just a few inches to disengage from the splines - this may save some brake disassembly.
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