I have that same leek and I can’t figure out where its coming from. I’m thinking its from the front dif. I have a feeling it was over filled during its last servicing. I had that happen ones on my bronco about 15 years ago. It was seeping from the seal on one side of the dif, after I returned it to its normal level then it was fine,I’m going check it this weekend.
Interesting. I was planning to service my diffs soon. Its been about 30k since I changed my diffs. If there is a bad seal on a diff though, what can be done?