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Moisture worked it's way in. Clean it up good and replace the gasket when you put the cover back on.

You are most likely running a petroleum based Gear Lube & the lighter chemicals are evaporating due to high temperature operation. After you completely clean everything, replace it with the correct viscosity of AMSOIL Severe Gear 100% Synthetic Gear Lube.

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Q: Why is there sludge in your rear differential?
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