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DIY: Rear Differential Breather Mod

Discussion in '2nd Gen Tundras (2007-2013)' started by csuviper, May 25, 2016.

  1. Jul 13, 2018 at 9:18 PM
    #121
    csuviper

    csuviper [OP] Moderator Staff Member

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  2. Jul 13, 2018 at 9:30 PM
    #122
    lionix

    lionix The Grey Moose!

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    This is my next mod
     
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  3. Jul 14, 2018 at 9:07 AM
    #123
    Travo60

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    Anyone have a picture showing how they mounted the ARB behind the tail light?
     
  4. Jul 14, 2018 at 10:09 AM
    #124
    JMB

    JMB Not new, just a little old.

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  5. Jul 14, 2018 at 11:10 AM
    #125
    Over the LINE

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    Exactly what mine looks like.
     
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  6. Jul 14, 2018 at 4:11 PM
    #126
    Sunnier

    Sunnier Pity the warrior that slays all his foes

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    I just moved the same that was attached to the rear diff, plugged it into the end of the tubing farthest from the diff.

    I've been reading along, about vaccuums and seals drawing in water... and that doesn't seem logical to me. Am I missing something?
     
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  7. Jul 16, 2018 at 9:48 AM
    #127
    csuviper

    csuviper [OP] Moderator Staff Member

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    Heating up the gear oil will cause pressure on the inside of the axle housing. That pressure is released through the vent. When cooled quickly like taking a dunk in a stream will cause rapid cooling and pressure to decrease in the housing. Since the vent is only one way it will seal up which creates a vacuum effect. The air will try to get into the housing in the weakest link to even out the air pressure. The weakest link is the axle seals. This is how water can get in if you are submerged.
    I like the fuel filter idea because its splash resistant. Keeps the filter media dry. What vehicle is that one from?
     
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  8. Jul 16, 2018 at 10:29 AM
    #128
    Over the LINE

    Over the LINE New Member

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    Here's mine. I just used a universal fuel filter, if that was your question.

    P7020086.jpg
     
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  9. Jul 16, 2018 at 12:21 PM
    #129
    dcsleeper408

    dcsleeper408 BASTRDS

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    With a filter at end the diff is open.
    Breathers act like a check valve. Reason for 1 way-2way breathing.

    Having that open end filter pointed down towards the bumper dissipates placing the breather at the highest point. It’s higher than normal, but I would be more concerned since it’s open at the end and pointing down.

    If I were to run a filter it would be more an in-line filter with a breather still at the end.
     
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  10. Jul 16, 2018 at 12:35 PM
    #130
    GodlessPro

    GodlessPro Bougie BASTRD

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    I haven't gotten this done on my new truck yet, but I'm thinking of doing exactly that, filter inline with the 2-way breather on the end.
     
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  11. Jul 16, 2018 at 12:41 PM
    #131
    dcsleeper408

    dcsleeper408 BASTRDS

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    That works! My buddy did the same. For 60k nothing through filter. But for $10 I don’t see anything wrong adding the inline filter. I just wouldn’t leave a open end filter at the end.

    I believe the oem is 2way. When I pulled it off I was able to suck and blow through it. I have to look for it and try it again. Reason was for this mod is to relocate it.
     
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  12. Jul 16, 2018 at 1:49 PM
    #132
    trayday

    trayday New Member

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    I've had my diffs submerged probably a dozen times, a few times were for a few minutes. There hasn't been any water seeping through my seals. I'm not saying it won't happen either.
     
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  13. Jul 16, 2018 at 1:56 PM
    #133
    dcsleeper408

    dcsleeper408 BASTRDS

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    Yeah. My Tacoma took a few dips before a few buddies explained to me how it works and what it does if not relocated.
    This is not necessary but it’s great insurance. Replacing seals are a pain in the ass.
     
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  14. Jul 16, 2018 at 1:59 PM
    #134
    dcsleeper408

    dcsleeper408 BASTRDS

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    Even with my diff breather I still had my tundra flushed out after it was submerged in mojave and no water made it through.. More peace of mind for me.
     
  15. Jul 16, 2018 at 2:06 PM
    #135
    csuviper

    csuviper [OP] Moderator Staff Member

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    Well if the OEM is really a 2 way then you can reuse it in a higher location and the whole vacuum thing through the axles is not accurate.
     
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  16. Jul 16, 2018 at 2:16 PM
    #136
    dcsleeper408

    dcsleeper408 BASTRDS

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    if the breather is submerged(highly likely in oem location), where else would it breath through. Seals would be the next thing in line.So you have the right mindset. Relocating the oem one is fine. I know tons of people that did that no issues and they dive in a lot more often, some almost mid way of the door.

    It’s really not rocket science for the most part. You are just relocating the OEM breather up higher. At oem location they are prone to be submerged. Potentially sucking water through the breather it self and or through the seals.
    It’s a cheap mod.
     
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  17. Jul 16, 2018 at 3:26 PM
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    Over the LINE

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    If I start sucking fluid from the height of my breather relocate, I'll get the diff flushed and filled along with a few other things. That assumes I don't have fried electronics and a totaled truck.
     
  18. Jul 16, 2018 at 3:40 PM
    #138
    dcsleeper408

    dcsleeper408 BASTRDS

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    Also if you take in water from oem location seals can blow outward- as if over flowed. If that makes any sense.
     
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  19. Jul 16, 2018 at 8:29 PM
    #139
    Pale_Horse

    Pale_Horse Sooooooooo White.

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    Thanks guys for posting the fuel filter idea. Genius. Saved me $60 on the ARB kit...

    Will Be sure to swap it out before next wheeling.
     
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  20. Jul 17, 2018 at 5:28 PM
    #140
    Cuzican

    Cuzican New Member

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    I had originally just relocated the factory breather to behind the taillight, but while relocating it, like others, I noticed it was just basically a check valve and didn't like that, so I used an intake air filter from a viair compressor. I found the filter online for something like $12-$15. In total I'm in it for about $30, for the fitting, hose, and filter.

     
    Last edited: Jul 17, 2018
  21. Jul 19, 2018 at 3:45 PM
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    lionix

    lionix The Grey Moose!

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    I picked up an Arb one for $58 bucks. I can't beat that, and I get their breather.
     
  22. Aug 28, 2018 at 1:19 PM
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    Sas

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  23. Apr 6, 2019 at 1:26 PM
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    jptshadow

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    Does the front differential have breather like that too?
     
  24. Apr 6, 2019 at 1:34 PM
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    Sas

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  25. Apr 6, 2019 at 2:03 PM
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    jptshadow

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  26. Apr 6, 2019 at 2:52 PM
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    Sas

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    Yeah, it never ceases to amaze me what a treasure trove of information this forum is.
     
  27. Apr 6, 2019 at 3:50 PM
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    Dr_Al

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    Wow, lots of overkill. First off the breather is not two way. It's nothing more than a rubber disk with a spring on top of it. The spring pushes up on the cap and down on the rubber seal against the metal base. It only vents pressure in the diff. Back in the day all we would do is remove the sheet metal cap and put a rubber hose on to the part that's left. The cap is sort of crimped on so the base already has a lip for a hose to go over. Put a hose clamp on it and the hose wont go anywhere. As for the other end we would simply make a full loop in the hose and then point the end going down as high up as possible. As long as the loop is vertical it's not going to suck up any water. That's when I was into mud and often had the rear axle a foot or more under muddy water.

    Now that I don't do that anymore I just simply twist the cap once a year until it spins freely is all that's needed. The cap should feel very loose.
     
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  28. Apr 8, 2019 at 12:05 PM
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    csuviper

    csuviper [OP] Moderator Staff Member

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    For my 2019 i was just going to buy this kit from Toytec rather than sourcing all the parts from various places again.

    [​IMG]
     
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  29. Apr 23, 2019 at 11:31 AM
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    Flyinryank

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    I was looking at that too but hose seems a little short. Did you get it?
     
  30. Apr 23, 2019 at 1:48 PM
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    csuviper

    csuviper [OP] Moderator Staff Member

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    Have not got it yet. Might need to do some measurements to see how long we really need compared to what is provided there.
     
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