I noted that after to run around 50 miles, at examinate the differential, there was a oil leaky coming from the axle vent of the diff. This only happens when I go to a highway, not in a small course.
I looked the axle vent hose, it was normal, no obstructed or cracked. I changed the oil thinking that it was old. The Pick-Up manual specified 75w140. I put oil at the level of the bottom of the check plug hole and did a test, but the leaky keeps going on. There's no leaky in other place, just there. There's no odd sound from the diff. How can I fix this?

 

where did you fill the diff up to?

 

at the hole. Did i put more oil would flood.

 

hmmm thats odd. I think something else is going causing the oil to foam.

 

i just looked under my truck yesterday and noticed that the bottom and right side where the fill hole is was kinda moist so mine leaks to. i know the rubber plugs have a tendency to leak but your situation kinda sounds a little different

 

What year is your truck. I have a 98 4x4 5.2 v8 it is pushing oil out the front axle breather tube cant figure out why it is doing it. my friend has a 98 4x4 3.9 v6 it is doing the same thing and i dont know what to do if you figure anything out please let me know. Thanks Mike.

 

get a longer hose?

 

humm... what thing?

 

If i make it any longer ill have to have sticking out my hood its the little black hose with a cap of some sort on it. I thought about doing a over flow bottle like on a rad but dont know if its safe to do that??

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Frame rail
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WOW....that's ALOT of overflow, to be pushing hydraulic gear oil that thick/heavy, up a 3 foot 3/8" diameter tube....I myself would have already drained it and popped the cover, myself. I'm with Varsis- either you got water in your diff, or something, causing it to boil/foam, and come out the tube. Maybe even check for worn teeth and/or gear lash?

Is your diff open, limited slip, detroited, or air/electric locker? I know the LSD requires a specific gear oil...