Raise vent tubes, need help

[James Morse]

I'm trying to move the vents up higher so it doesn't suck in water. I'm not clear on where they all are.

Front:
Looks like trans vent is towards the rear on top of trans on driver side according to book.
Front diff vent should be on pass side on top again by book.
Not sure about vent on xfr case can't find in book, where is it?

Back:
I see one coming off the rear axle on the driver side. Shouldn't there be one off the differential as well? Not seeing it yet.
---
so there should be 5 vents in all? or am I messed up. there's more than that? less?


Side question, I think, what is steel tube that comes down looks like from trans and just dead ends open pointing down?

 

[sgtsandman]

The one on the rear axle vents everything since the gear oil generally doesn't fill the axle tubes. I can't tell you on the automatic transmission. I didn't see a vent on the transfer case when I dropped my transmission to change the slave cylinder.

 

[Curious Hound]

I don't think the transfer case has a vent tube. Or maybe the transmission. Anyway, I knly found a vent on one of those.

Front axle/differential is on the top, somewhat to the passenger side of the Duff.

Rear axle vent is usually on the axle tube. This serves the whole axle/differential, since they just have one common cavity inside, all the way from wheel seal to wheel seal.

That's why there are only 3 tubes attached to the vent block I made.

 

[pjtoledo]

that brass looking nipple is the vent port. it has a short plastic tube pointing up.

 

[Curious Hound]

That's it. I remember that in the transfer case. I just went outside and tried to brave the elements and get pictures for you. But it's raining pretty hard. I just couldn't get in a good position to show the transfer case. I'm soaked. PJ showed you the vent on the transfer case.

Here is the one on the rear axle. Right there to the right of the shock.

Here is h one in the front axle beam/differential. Just to the right of that pivot bracket.

 

[alwaysFlOoReD]

The ones I have seen are shaped like a question mark. So like a snorkle for diving, there shouldn't be any water able to get up. But if people are extending the vent tubes, there must be a reason.

 

[sgtsandman]

The ones I have seen are shaped like a question mark. So like a snorkle for diving, there shouldn't be any water able to get up. But if people are extending the vent tubes, there must be a reason.

If the T-case is warm or hot and it gets hit with water, the sudden cooling can suck water in.

 

[Curious Hound]

If the T-case is warm or hot and it gets hit with water, the sudden cooling can suck water in.

Same for diffs.

plus, I just like knowing that I don’t have to worry about them until the water gets up to my chest as I’m sitting in the driver seat.

 

[pjtoledo]

If the T-case is warm or hot and it gets hit with water, the sudden cooling can suck water in.

oops, didn't mean to laugh

 

[sgtsandman]

oops, didn't mean to laugh

I was wondering what you were laughing at.

 

[James Morse]

ah, no one ever answered about the open tube in the pic on original post, it must be a vent for something, I don't think it's one I'm interested in.... but I can't figure out what it is

 

[Curious Hound]

ah, no one ever answered about the open tube in the pic on original post, it must be a vent for something, I don't think it's one I'm interested in.... but I can't figure out what it is

Follow it back and find out where it goes.i could only guess. It might be the source of all your problems.

 

[RonD]

ah, no one ever answered about the open tube in the pic on original post, it must be a vent for something, I don't think it's one I'm interested in.... but I can't figure out what it is

Its the automatic transmissions vent, seen here: https://shiftritetransmissions.com/wp-content/uploads/2017/12/4R55E_001-16.jpg

Yes, trans vent is at the top rear and you can high jack it from there to a higher point
The metal "loop" tube is to condense any ATF vapor that may come out and let it run back into trans once it condenses, so no "oil drips" from the end of the tube

You also need to use "vent caps" on the ends of the hoses so bugs don't block the vents
Google: Dorman Differential Vent Breather

Several kinds of these breathers

 

[James Morse]

Thanks. Eric there's no issue right now I'm just trying to prevent one in future.
Yeah need breathers for sure. I think Eric made his, maybe.
Still not clear about the open tube it doesn't seem like a breather since it's down so low -unless- it's supposed to have a tube on it going back up. I can't tell where it goes. But the fact it's open implies stuff can come out of it meaning stuff can also go in unless there is a check valve on it which I doubt.
Seems like then there are 4 breathers - front/rear diffs, trans, and xfr case.

Well so in trying to find where that open tube goes, I noticed this: maybe hard to see, but, in the pic, you see the p-brake line and it runs -over- the odd shape reinforcement that runs parallel to the frame beam. It looks like that reinforcement was at some point bent inwards but here's the thing I can't see any indication of anything ever having happened to it... anyway... isn't the brake cable supposed to run -inside- that reinforcement not -over- it?
Maybe somebody tried to jack on it sometime that could probably push it like that.
I got a couple choices, leave it alone, it's not hurting anything (although it's really bad policy to have the cable run over it like that). Or, try to bend it back or have somebody do it but the reinforcement is not trivial, I think you'd need to get a jack in there or something. And I suppose there's the chance maybe it mucks up something else (shouldn't, though). So I'm tempted to kind of just say "huh" and leave it but I'm thinking probably I should put it on a list to try to address it in the future.

 

[RonD]

Differentials are filled to about 1/2 way up the axle tubes so the outer wheel/axle bearings are lubed

All fluids EXPAND when heated
That's why there needs to be vents, so there is no pressure build up inside these containers which would blow out seals that are suppose to keep the fluid inside, lol

Not sure what you mean about the transmission vent?
The metal tube loops up on the back of bell housing then down again to the open end
At its location in the air stream under the vehicle it would pull out any "smells" of hot trans fluid while driving, also a safe place to expel any overheated(or overfilled) transmission fluid, if that should occur