My experience with two civilian vehicles is that the bearings in the
differential have worn, allowing the relative positions of the ring and
pinion gears to change. No noise when under power, but when off the throttle
you get a whine, or worse.
On first vehicle the bearings continued to wear and the differential had to
be rebuilt, including new ring and pinion. (Ring and pinion were not
damaged, but when new bearings moved them back into their original
positions, the noise still occurred because of the new wear patterns on the
teeth caused by being out of alignment in the first place.)
Second vehicle had whine in rear end from 33K to 128K, at which time I sold
it to an acquaintence, and it's still going strong. Bearings never wore
further, for some reason. You just had to be able to stand the whine.
Hope this helps.
Mark McKee
'52 M38A1
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