Can a clogged breather cause the front diff to leak.

And on that note, the t-case is above the trans as near as I can tell. Not the greatest placement of those by Toyota haha

 

Update,

Front diff has been dry since I fixed the breather. I went throught the touchless car wash yesterday and did the undercarriage wash. I took a look at the diff this morning after my morning commute and noticed a tiny bit of weapage and the bottom of the seal/axle housing. Just a very tiny about of diff fluid. No drop just can feel it by touch.

I wonder if the high pressure undercarraige wash is causing the issue? I know it sounds odd but its been dry for over a month until I went throught the wash. It seems odd the seal would just randomly leak sometimes.

 

The car wash should not cause the issue.
It’s either a bad seal, not installed properly, or the differential is building pressure.

With that said, since you say it’s weeping. I wouldn’t worry about it at all.
I’m of the opinion that a weeping seal isn’t an issue. My rear seal actually used to leak, then it slowed to a weep. I don’t usually have to add any to it for about 6-7 month. And then, it is only MAYBE. 1/4 of a quart it less.

 

I just had shoulder surgery a few weeks ago so I can't really do any auto work right now. I'm getting my brakes done next week, I think I am going to just have a new seal put in as a prectaution. Also have the breather line checked as well. I have an oem seal at home so for a a bit of extra labor it makes sense just to do it again. Its weird the seal lasted 30k. I wonder if when the diff puked from the clogged vent, that it caused damage to the seal.

 

Reviving this thread, Im having an issue where my diff vent nipple and the hose that connects on the top of the front diff on my 3rd gen popped off and was leaking oil. At first I thought it was a bad sealant leak. After closer examination it’s the hose since it’s a little loose on the fitting. ive since reattached it (what a pain that was). Even though it’s attached, it’s still slowly dripping out. Here are some photos. Any thoughts? Could my breather be clogged building any pressure? Really not sure what to do…



you can see the oil dripping down the diff as well. This photo was taken before I reattached the hose. Also for context, ecgs front and rear swap ins, with 5.29s and 85w 140