Hi Burco,
All the bearings are readily available.
Are you leaking any oil ? The pinion bearing sits higher than the rest of the bearings and is usually the first to go due to a low oil condition.
I would disconnect the driveshaft from the pinion flange and get someone to spin a rear wheel while checking the pinion with your hand for roughness or play.
I blew a pinion bearing once when I misinterpreted pinhole leaks in the diff cover for a weeping gasket.
My experience is that worn or rough gear teeth can growl, yet still go for a very long time, but a bad bearing is apt to completely fail in a short time.
Good luck, Peter
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