I just replaced the rear axle seals on my '94 2WD. As suggested on this forum, I want to make sure the vent is not plugged. I assume it's the gizmo up on top of the housing. At first glance, I thought it was an electrical line. Where does this vent connect and what would be the best method to determine if it is plugged? Also, could the new gear oil be added through the vent hole? The fill plug looks like it will be a bear to get out. Thanks

 

The vent comes out where the block for the brake lines is on the back of the rear

 

It looks like a bolt with a hose, or a place for a hose, where the brake lines join coming from the flex hose, its on th driver side axle tube, with the hose off you should be able to poke a wire hanger, etc down the hole,

 

X2 it is on the drivers side of the axle on the axle tube its self,

 

I would have popped a picture, but its dark and 20F out.

 

found it. thanks to all who replied. the hose was broken off at the fitting. vent was clear but the hose is plugged. maybe pressure pushed it off?? also, what is the electrical looking connection at the top of the diff housing?? i'm just curious.

 

that is your VSS- vehicle speed sensor, runs the computer, speedo(92-96 models) and controls your ABS

 

That electric looking thing is your vehicle speed sensor.