I have a vacuum line coming up from the NV4500 Manual Tranny that doesn't have anything connected to it and I'm tryin to figure out what it's for. I hate those empty connections. It's a small green tube that comes off the top of the tranny and runs up the center of the firewall and on my truck that's were it ends. It's just stickin up out of a cluster of vac lines.

 

vent?? That's what I would call it to make me feel better

 

X2 its a vent for the trans.