Also I saw this black stuff on my exhaust but it is not oil, some was wet and I touched it, it was just dirty water... runoff from somewhere drains there? Or is something screwed up? I thought it was the rear diff bushing at first. I don't know.
Thats you differential main bushing failed. It has silicone gel inside the rubber isolator. Once the rubber cracks/tears, the fluid comes out. You can see it running down your diff as well.
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