1990 Mighty Max Rear Axle Vent

I am in the process of putting back together my 1990 mighty max and trying to find any information on the rear axle vent hose. There appears to be an insert into the top of the rear axle on the driver side. The connector is broken and the the opening appears plugged. Two questions:

1. Can the connector/insert be repaired or replaced?
2. Where else did it connect?

I am unable to find any information in my service manual or online. Any help would be appreaciated!

Thanks!

you can just put a little filter on it,
cant quite remember on these trucks, but some have the tube go up behind one of the tail lights, others have them go into the engine bay.

Basically do whatever you want, just keep it higher than any water you think you will drive through