Differential venting

[MuddyBuddy]

Tools:
*Screw driver
*Razor blade
*Pliers

Supplies:
*50' air hose $10
*Hose clamps $5
*Air fittings $10
*1' long, 1/2" ID fuel hose $1
*Silicone $3
*Zip ties
*Bling bling breather fitting $10




The 3/8" air hose should have threaded fittings on both ends.  You will use one end to run to the front diff and one end running to the rear diff.  The threaded ends will meet at a t-fitting under the truck just behind the passenger seat.  The third connection of the t-fitting will run a hose up through the body and follow the stock roll bar to the top of the targa.  I used a $10 breather to cap off the end of the hose.

All the hoses connected.  Rear, Front and Up.


Close up of the t-fitting.


From the t-fitting to the differentials, route the hose high and tight along the frame rails.  You don't want anything getting snagged by the trail or moving drivetrain components.  For the front, I followed the stock brake and fuel lines along the inside of the frame rail.  For the rear, I zip tied the air hose to the underneath of the body, just in front of the gas tank.  When measuring the length of hose and fastening it to the truck, be sure to leave plenty of slack at the axles to allow for suspension drop and compression.

At the differentials, use pliers to pull off the stock breather cap, spring and rubber washer.  Clean the fitting to remove dirt or rust that could fall into the differential.  Cut your 1/2" ID fuel hose to about 4" for each axle.  Using silicone and a hose clamp, press the fuel hose over the stock breather valve and tighten it down.  Using silicone, insert a 3/8" barbed air fitting into the end of your air hose, barbed end first, leaving only the threaded end exposed.  Using more silicone, insert the air hose and barbed fitting into the 1/2" ID fuel hose and fasten it tight with another hose clamp.  The 1/2" inside diameter of the fuel hose is the same as the OD of the air hose and stock diff breather valve.  The barbed air fitting is only used to prevent the hoses from collapsing from the hose clamps.  Do the same for the rear differential.

Assembly of hoses at the differentials.




Lots of slack at the axles.


Front routs through the lower engine compartment.


Rear ties off near the gas tank.


For the snorkel that goes up, use a barbed fitting with silicone to connect it to the t-fitting from the axles.  Route it up through the floor drain hole behind the passenger seat.  Use a rubber grommet here to prevent the body from cutting into the air hose.  Let the hose follow the stock rollbar to the bottom of the targa bar and cap it with a filter. 

Through the body, behind the passenger seat, using a rubber grommet.


Bling bling filter under the targa bar above passenger seat.


Use lots of zip ties to keep things clean and out of harms way, and leave plenty of slack at the axles to prevent overextending the hoses.  I used standard air hose and fittings so I can later tie in my transmission and t-case with ease.  Also, at $10 for 50', 3/8" air hose is much cheaper than fuel hose for $1 per foot.  I've been as deep as 3-1/2 feet with no problems yet, but with a snorkel under the roof, I'll need SCUBA gear before my diff's are in danger.

3-1/2 feet deep, no problems.


Dave

[colts_zuki]

That looks good,im gonna do diff breathers and i never thought about going inside the veichel. Is that just an aircleaner on the end of the hose? Nad also do you have a snorkel on your rig?

[MuddyBuddy]

Yes, it's just a K&N style cone air filter only smaller.  $10 at Autozone by the import tuner accessories.  Made by Spectre, part #3992.  Most people run the hoses into the engine compartment under the hood, but I like it inside.  It cost me almost nothing extra, I was able to use just one filter and higher is better.  Even with the top off, the targa will protect it from rain.

Dave

[Joe S.]

i think that is one of the cleanest sami undercarriages i have ever seen!

mine was dirtier, and it was never used offroad before i got it!

good idea too! 

[MuddyBuddy]

The last pic is my worlds largest undercarriage cleaner.

[phoenix827]

Anyone got pics of the vents on the tranny and t/case? Need to know where to look for them.

[1.9TD_Zook]

Here ya go ...

[phoenix827]

I take it the tranny has to be done through the floor then? Thanx!!

[1.9TD_Zook]

I take it the tranny has to be done through the floor then? Thanx!!

I don't know if it is threaded in or not.  I'm rebuilding the trans Monday so I'll let you know.  If it is threaded, an elbow would work great and then just run a line to the firewall ...

[phoenix827]

No, I mean just to get at it enough to get a line on. No biggie! I am working on them now, will post back when I am done.

[wflaw45]

all i need it the time!

[Jigsaw]

That looks good,im gonna do diff breathers and i never thought about going inside the veichel. Is that just an aircleaner on the end of the hose? Nad also do you have a snorkel on your rig?

Mine run up through my snorkel 

[phoenix827]

Mine run up through my snorkel 

I need to do that too, I got everything up under the hood for now tho.

[zukfreak]

running them through the snorkel works the best i also did that to mine and its alot cleaner too you dont have a maze of breather hoses

[Marks143]

What if you roll, you will have all that STANK OIL in the cab with you.