the TT setup has a fitting on the diff and a rubber hose that goes to that go another nipple on the frame cross support inbetween the spare and gas tank. The NA has this still funky fitting on the top that Gordo posted. No hoses at all. I've seen a number of NA diffs that weep out oil from this vent including my own and from what I can tell it is somewhat normal. Just don't go wading across rivers and you should be ok.