I have a 1997 F-250 with the Sterling 10.25 rear axle. The vent tube is missing. The vent still threaded in the axle, but there is no hose attached to it. I'll pull it and make sure it is clean, and I can get a hose to attach to it, but I can't find any pictures or diagrams showing where to route the hose. Can anyone point me in the right direction?