Front Diff Hose Identification Help

Hey guys,
I had a quick question in regards to a hose coming off the front differential. I was installing a Superlift suspension on my truck and when I dropped the front differential to install the brackets I was struggling a little bit doing it by myself. When I got everything tightened back up, I noticed there was a black rubber hose that was free at the end not attached to the front differential. I was wondering if anyone could identify it for me and tell me where it attached to?
I took pictures of the attachment to the front differential and then of the free end, sorry for the poor quality. Thanks in advance for any help!! -tim

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