Because the tranny and tcase are hard to see where they start and are hard to reach, especially the tcase

 

Run a new complete line is my advice...that is what I did after a fight trying to locate the end of the breather tube. I ran the new tube up in the same area as the stock tube but dropped a string from the top and placed a clamp on the end of the new line and pulled the new tube up into the engine bay with the string. the only thing is you need to purchase a new breather tube cap.

 

The end of the transfer case and tranny come up just behind the engine along the firewall in the middle of the jeep. Reach down there and they will come up to a point easier to mess with. In all honesty, the factory has set them up pretty damn high, unless you occasionally run water over the hood.

 

I thought the same thing when I was searching for the lines. Mine are almost even with the battery, which I was pretty surprised to find out. I don't plan on doing anything thats going to be that deep... until I do get a snorkel

 

Is it possible to run the breather tubes up the snorkel?

 

I don't see why it wouldn't be. But then again, I don't have a snorkel!

 

Man lucky as mine transfer case line was 1/2 between the top of the engine compartment and skids. Not near high enough for me. It was a B with a itch to get my hands up between the firewall and engine and I finally just lost it and cut my losses and clipped the breather tube line and ran new tubing.

You could....but why???? Just run them to your stock airbox. With the new holes drilled into the stock box for the lines just seal them up with silicone as the stock airbox is sealed or at least should be sealed if you installed a snorkel as per the instructions.

 

I'm not drilling new holes into my airbox, I'm putting a T junction into the breather tube for the engine oil. My airbox is sealed tight!

 

I finally got off work and got to working on my jeep. I went through the top of the engine and spotted the tcase breather cap right away. I pulled it off and slipped the tube down to the bottom. Once I had all the breathers down, hooking up everythig was a breeze. I connected the rear axle breather to the main tube and ran it on top of the gas tank, ziptie-ing it along the way. I ran the tcase and tranny breathers to the main hose running along the passenger side. I brought the main hose up behind the radiator, just below the fan and joined in the front axle with a "T". Instead of splicing it into the oil breather, I went ahead and drilled a hole into the air box and hit it with black silicone when done. I'm pretty satisfied with the way it looks and the way if was put together and it only cost me $25 in parts

 

The breathers are designed to allow hot expansive oil vapors to move out of the above mentioned housings; and prevent a positive pressure from building up and causing the oil seals to leak. On the flip side; when the housings and oil cool down, the breathers will allow atmosphere to enter the housings to equalize the air pressure inside; and allow condensed oil vapor to drain back into the housing.

If you plumb your vent lines into the crankcase breather tube (a negative pressure or vacuum source) you will always have a negative pressure within the housings when the engine is running. Sounds like it could be a good thing; to draw off those vapors. The continuous vacuum from the engine will pull oil vapor out of your plumbing.

However; if you plumb the various lines into a larger manifold tube you may create a scenario in which any curved or "S"-shaped tube may create low spots in the plumbing. Cooled, condensed oil vapor will collect in the bottoms of the curves. And, the small vacuum created by the cooling housings cannot pull the oil back. Everything in your vent system must continually run uphill towards the highest point (engine breather) so that the oil can drain back into the housings.

Basically you'll be checking and adding oil to your housings continually. AND... since you have connected all the housings together via your plumbing; you may also be exchanging oils amongst the various components. I'm sure this is the reason the factory individually vents the different components. KISS (delete the second "S"), no need to join all the vents together; and don't connect vents to any negative pressure source. Just my 2 cents.