The rear diff can leak in several areas, and fixing these leaks will usually mean a lot of labor involved.  There are oil seals on the front pinion and both stub axles.  The rear diff cover can also leak at the flange, and this requires replacing the gasket and draining and refilling the rear diff fluid; unfortunately the rear cover is integrated into the upper diff mounts, so removal is a royal pain - the front/pinion is still attached to the front nose of the differential housing and detaches from the rear cover/upper diff mount.  Minor leaks (no drips onto the floor) can be ignored for now and end up being an annoyance.  The drain plug should have an (aluminum) crush washer to seal the fluid in.

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