What's wrong with my differential?

So my differential on my 99 ford f150 is half normal looking and the other half looks wet. Do I need a new seal or something?

Is it leaking around the differential cover or the input shaft. If it is the cover, you might try tightening the bolts to spec. If it is the input shaft, it sounds like a seal is leaking.

Umm you mean 1 side vs the other? Common failure on those trucks. Weird deal as well, right around that time they had 2 different stud sizes.

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