Diff Disclouration

[TexasRebel]

Seals, like everything else, are not 100% effective. Especially when shaft speeds increase. Increased speed is increased vibration which can create tiny gaps between the seal and the shaft. Mix that with thinner, warm oil, and some will definitely get past the seal. If you look at shafts that are designed for high speeds and heavy vibration (ie. crankshaft) you'll notice an oil slinger before the seal. It's job is to be a point where oil cannot pass without being flung back into the crankcase.

(The disk between the PTO flange and the last main journal)

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[EXP Jawa]

What I can tell you (without knowing the specs of the seal used) is that we have one of these carriers mounted on our test stand in the lab, and force oil circulation through (the ring gear doesn't spin in the test). We pump oil into the drain fitting and out through a fitting added near the top (so oil flows bottom to top, maintaining some pressure to force it to stay full). The seals don't leak - but the shaft speeds are low (10-15RPM), since we're only testing differentiation. I can see that changing when the shaft speeds are realistic.