Differential Vent Relocation - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 General Tech Q&A > Off-Road

Off-Road For suspension, wheel, and tire questions DIRECTLY related to Off-Roading.

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  #1  
Old 09-25-2008, 09:52 PM
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Differential Vent Relocation

Well guys, we have talked about this before, but noone has really looked into it much.

It was raining a ton tonight, but I wanted to get this done before the weekend. At least it was dry under the truck. Also, sorry about the poor image quality, I didn't want to break out my nice camera in all the rain. Option 2 was my cellphone.

So, first of all, here is the vent in its stock location:



The vent itself seems to be very similar to a hummer type snorkel:



Close up of the vent:



The stock height of the vent is ~22" above ground. I knew there was a possibility of hitting some deep creeks this weekend, so I needed to do something about that height. I like a little better safety factor.

So, I attempted to take the little bugger off, but to no avail. The vent is in there pretty good, and I certainly didn't want to pull the little top off. So extending the vent was not an option without cutting the vent hose. I investigated where I would put it if I did elongate the vent. The Roadie suggested the fuel filler recess in the rear quarter panel. After looking at that location more, there was all sorts of gunk in there, because the rear wheel sprays almost directly into that hole.

So, I decided to try a different approach.

I looked around the immediate area, and finally found a nice hole in a body structural support bar. The end nestled perfectly in there. This would give the vent protection from splashes and would provide a short pocket of air incase I hit a hidden underwater hole.



I used a couple zip ties to hold it to another group of tubes, and the new vent holds well inside it's new home.

New height from ground? ~33"

Cost of mod? $0.02

Now... anyone have a clue where the front diff vent is?
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  #2  
Old 09-25-2008, 10:01 PM
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Quote:
Originally Posted by JamesDowning View Post

Now... anyone have a clue where the front diff vent is?

My best guess would be 33" off the ground


So... What do I win?
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Old 09-26-2008, 03:08 AM
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I seem to remember seeing it on the passenger side of the engine, but that doesn't make a lot of sense. It will be daylight in 7 hours here - quicker for you. But I think it's up higher than the rear already.



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Old 09-26-2008, 09:12 AM
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Quote:
Originally Posted by the roadie View Post
I seem to remember seeing it on the passenger side of the engine, but that doesn't make a lot of sense. It will be daylight in 7 hours here - quicker for you. But I think it's up higher than the rear already.
Eh, I was a rush this morning, didn't get a chance to look. Maybe you'll have time? <nudge> <nudge>
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Old 09-26-2008, 10:12 AM
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I don't have a photo, but my recollection is that it is on the driver's side, directly above and inboard an inch or so from the fill plug.

I remember seeing the hose go vertical, but I never checked to see where it went or how high it went. Just remember thinking, "Oh, that's the vent hose for the differential."

Mark
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Old 09-26-2008, 12:09 PM
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huh i checked under mine, i ain't got that, what is it for ?
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Old 09-26-2008, 12:18 PM
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You don't have any hose at all from your rear differential?!?

Diffs need a vent. The transmission uses the dipstick as a vent, but when the internal pressure goes up and down relative to the outside atmosphere, such as from a temperature or weather change or especially in case of climbing mountains, if there was no vent tube, the internal pressure of the diff could blow out a seal.

Diff vents are there for the same reason you pop your ears through your eustachian tube.

Since the tube has to be open in some way to the atmosphere, it needs to be connected to a tube whose opening is higher up than any water crossing you intend to drive through. It's bad for the diff oil to have water mixed in with it. The deeper the water you intend to cross, the higher up you need to have your vent tube opening.



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Old 09-26-2008, 01:47 PM
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I like what some of the shaft-drive ATV's have... It's basically just an "accordian" looking sock that expands and contracts with temperature as needed... The only thing is, if you get water past the seals, if nothing's open to outside air, there is no "baking" the water out...

Mike
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Old 09-26-2008, 02:16 PM
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You don't have a vent?
maybe this picture will help, its from the rear of the truck as you can tell.



Surely you've got it?
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Old 09-26-2008, 02:49 PM
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Haha, Thanks for the good picture. My cell phone pictures were pretty terrible. However decent considering I was out there when it was pitch dark and raining, with a flashlight in my mouth, trying to aim that dang phone.
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