Hi All...I have a 1999 Silverado that I recently noticed tranny fluid on the undercarriage (quite a bit).

After searching for a leak, what I found was a tube at the top of the transfercase that leads back to the tranny...and its from this tube I find where the fluid comes.

Any ideas on what this is? Is it a vent tube? And if so, is this telling me the filter is clogged or something else?

Thanks for any responses!
Ed

that vent tube is so that the tranny can vent hot air as the tranny heats up. if you are getting fluid out of it , it means the tranny is either over full or the tranny is running too hot. service the tranny and make sure the level is correct.