G749 Rubber flex lines
Now I know what you're talking about. Topo has you all squared away. It's too bad you're so far away from a brake shop. They'd just match your length and put the correct ends on so you could just remove and replace all you rubber. I don't know enough about the "Axle Vent Tube" to tell you if they require pressure lines but someone will chime in and tell us.
Did a quick scan through the manual but didn't really find the answer yet. I do recall something about a few pounds of positive pressure in the diffs and the vent lines running to a funky looking device on the fire-wall under the hood, just above the height of the air intake........but that is just not important right now.
What is important is that if you don't replace the "Axle Vent Tube", you'll still stop. Pull the rubber, blow them out and check the condition. Might be good to go.''