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I will add, if you look at your pinon/pinion seal AND the fill level plug.  The fill level is actually just a hair BELOW the pinion seal. 


The pinion seal is not designed to hold back a FLOOD of gear oil but just a small amount/splash.


Same as a rear main seal on an engine.


Given that fact, the (outer) pinion bearing is the first to fail as it lives the hardest life.


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