That is the rear diff pinion oil seal leaking.
PITA to replace unless you understand the preload adjustments to the pinion bearings.
I'm afraid you need a mechanic for this one.
Or a friend with mechanical knowledge.
Just keep an eye on it if you have to drive for a few weeks before getting fixed, and check the diff oil level each week.
Hopefully it will just be a faulty seal, and not worn bearings.
Good luck.
PK
Wow - 5 responses while I typed. You guys and gals are on the job today.
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