I must say that I can't see the ring and piņon gears due to there thickness and metallurgy taking on a set by being run however many miles you care to talk about
However waring in a bit is a different story.
Maybe the whole rear assembly minus the gears had been beat on so much or involved in a accident such that it is out of wack.
Surly the temperatures that a rear runs at with the needed level of fluid in it will never run hot enough to change the tempering of the gear package.
Just like with engine bearings sitting in there respective journals will be thrown off by the smallest spec of crap under them, so will a Bearing cup be cocked if there's a spec of crap that does not allow it to seat perpendicular.
The OP should pull it apart, or have someone pull it apart and inspect all of it in great detail.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!
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Two dry rotted 14 x 10 Micky Thompson slicks.
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Two pairs of brown leather flip flops, never seen more then 2 mph.
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