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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
That is the vent tube from your differential. Allows excess pressure out when things are warm in there. You might have too much fluid if it's blowing it out.