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My Differential Breather Mod Photos

Discussion in 'Technical Chat' started by David K, Sep 5, 2010.

  1. Jun 22, 2013 at 2:30 PM
    #341
    DoorDing

    DoorDing Thank you, Nancy Roman

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    If you blow through the original part from the axle, you'll see that the movement is actually the valve at work. Push it in, and the air flow is stopped. The new part doesn't act as a valve, so there's no movement.
     
  2. Jun 25, 2013 at 6:21 PM
    #342
    David K

    David K [OP] Well-Known Member

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    Differential Breather Mod Light Bar: 2 Hella 4000 HID, 1 Kragen HID, 1 Cibie Halogen.
    That is the whole point of doing this mod... to put a real breather on the end of a tube, above any deep water line.

    The thing that is on the differential from the factory is a one way VENT... It has a spring loaded seal that takes a pressure build-up in the diff. to push against the little spring, and let gasses vent to atmosphere.

    A BREATHER allows venting AND vacuum breaking! That's the key, to break a vacuum created inside the diff., when you cross a stream... The sudden cooling of a hot differential makes the outside air/ muddy water want to suck INTO the differential, passing the rubber axle seals.

    Yes, it happens... either how I explained or or another way, the differential oil gets contaminated.

    Why does Toyota put a remote breather on the front differential, but not on the rear? Specially on OFF ROAD or 4WD Tacomas...??!!

    This mod put the same breather Toyota has on our front differentials, on the rear... and up high in the bed compartment or the gas fill bay, etc.

    Didn't I cover all this in the first page of this thread? No problem, I like talking about my Tacoma... Hope that explains it, but don't hold back if you have questions!
     
  3. Jun 25, 2013 at 7:18 PM
    #343
    Frogsauce

    Frogsauce Well-Known Member

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    Billies + AAL, Breather housing mod, TruXport Tonneau Cover, Custom Wood Rear Seat Extender, Firestone Dest A/T's, Swing Case
    Hey David, the two breathers that are right next to the battery on an '09 off-road are the Transmission and Front Diff breathers? Or are they something else...

    I'm try to find ALL the breathers on the truck similar to this:

    http://www.tacomaworld.com/forum/off-roading-trails/15093-scuba-mod-relocating-front-rear-diff-tranny-transfer-case-e-locker-breather.html

    But I think two of them are already relocated. Either way, I am running all of them into these instead:

    Specter Breather

    Then I will partially cover those to protect from splash off the fan if it catches water.

    Does that sound sane?


    EDIT: I am running all of them to the driver side front up to a custom bracket I made. Will post pics if this all works out.
     
    Last edited: Jun 25, 2013
  4. Jun 26, 2013 at 8:19 AM
    #344
    David K

    David K [OP] Well-Known Member

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    Differential Breather Mod Light Bar: 2 Hella 4000 HID, 1 Kragen HID, 1 Cibie Halogen.
    Yes, front diff breather is one of the two by the battery... and your breather choice looks good to me!
     
  5. Jun 26, 2013 at 8:35 AM
    #345
    Frogsauce

    Frogsauce Well-Known Member

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    What's the other one? :confused:

    I'm going to start it this Friday since I am off. Hopefully, everything turns out nice.
     
  6. Aug 20, 2013 at 9:52 PM
    #346
    David K

    David K [OP] Well-Known Member

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    Differential Breather Mod Light Bar: 2 Hella 4000 HID, 1 Kragen HID, 1 Cibie Halogen.
    See this photo, lower red square, by frogsauce:

    [​IMG]
     
  7. Aug 21, 2013 at 8:25 AM
    #347
    David K

    David K [OP] Well-Known Member

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    Differential Breather Mod Light Bar: 2 Hella 4000 HID, 1 Kragen HID, 1 Cibie Halogen.
    FYI: ADD = Automatic Disconnecting Differential. Like 'automatic hubs', but no need to drive in reverse to complete the unlocking. Permits shift-on-the-fly into and out of 4WD-HI, from inside your vehicle, stopped or moving.

    Before the ADD or AUTO HUBS, one had to get out and rotate the hubs from free to lock to use 4WD. Before hubs (old 4WDs), the front driveline rotated even in 2WD.
     
  8. Aug 21, 2013 at 4:03 PM
    #348
    DoorDing

    DoorDing Thank you, Nancy Roman

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    I understand that the ADD disconnects the front axles from the transfer case, but aren't the CV axles splined to the front hubs, meaning they're still rotating in 2WD?
     
  9. Aug 21, 2013 at 4:13 PM
    #349
    David K

    David K [OP] Well-Known Member

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    Differential Breather Mod Light Bar: 2 Hella 4000 HID, 1 Kragen HID, 1 Cibie Halogen.
    I welcome Toyota Tech input... The whole idea of Auto Hubs, the ADD and Selectable Hubs in general is to reduce wear on the front driveline and increase fuel economy. Is one of the two half axles spinning with one of the two front tires, or are both not connected?
     
  10. Aug 21, 2013 at 4:18 PM
    #350
    DoorDing

    DoorDing Thank you, Nancy Roman

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    I don't have time right now, but if we don't get an answer, I'll lift the front later and see what spins in 2WD.
     
  11. Aug 21, 2013 at 4:32 PM
    #351
    David K

    David K [OP] Well-Known Member

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    Differential Breather Mod Light Bar: 2 Hella 4000 HID, 1 Kragen HID, 1 Cibie Halogen.
    I hope nothing! The spinning would come from the front tires rolling since the transfer case is in 2WD.

    If someone could mount one of those web cams under the truck and drive in 2WD, we can see if either front half axle or front drive shaft rotates with the tires or just a little from centrifugal force... ???
     
  12. Sep 18, 2013 at 5:45 AM
    #352
    Frogsauce

    Frogsauce Well-Known Member

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  13. Sep 28, 2013 at 12:09 AM
    #353
    David K

    David K [OP] Well-Known Member

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    Differential Breather Mod Light Bar: 2 Hella 4000 HID, 1 Kragen HID, 1 Cibie Halogen.
  14. Oct 4, 2013 at 9:38 AM
    #354
    gonathan85

    gonathan85 Well-Known Member

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    Mod completed! For those of you who elected to locate the new breather in the gas cap compartment, did you have trouble drilling a hole for the hose to protrude through? I chose the rubber grommet method, and it came out clean.

    Drilling a 5/8" hole at a funny angle (due to gas door) in the plastic was somewhat precarious. I started with a 1/4" bit, after using an electrical tester to create a pilot "dimple" in the plastic. Then, I progressively stepped-up the bit size 4 more times with 4 slightly larger bits to eventually end up with a 5/8" hole. I used a 31/32 x 1/2 rubber grommet purchased at Lowes #139377 to give a clean factory finish. Also used a 1/4" to 5/8" #4 SS clamp to secure the 5/16 ID fuel line to the threaded barb fitting. :thumbsup:

    [​IMG]

    [​IMG]

    [​IMG]
     
  15. Dec 26, 2013 at 9:26 PM
    #355
    totmacher

    totmacher Well-Known Member

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    Just FYI, that yellow high pressure hose on pg 1, 3/8 in x 5/8 out, is clearance item at Lowes now. I think it was $0.66 per foot when I got it today.

    They had some red air line hose that I assume would work too if you just don't like yellow.
     
  16. Dec 27, 2013 at 3:27 PM
    #356
    David K

    David K [OP] Well-Known Member

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    Differential Breather Mod Light Bar: 2 Hella 4000 HID, 1 Kragen HID, 1 Cibie Halogen.
    You don't see the hose unless you are under the truck, so color doesn't matter. However, the yellow sure made it nice to show the install!
     
  17. Mar 19, 2014 at 5:22 PM
    #357
    jtacoma1

    jtacoma1 Member

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    Thanks for the MOD right up. Did such a good job selling me on the benefits of the breather for the rear now I'm thinking I should change the breather in the front to the two way - similar to the part that the MOD called for in the back.

    Correct me if I misunderstood, but it seems like the front diff breather is only a one-way valve and not a "true breather".

    I understand that the front will not get contaminated due to its height compared to the rear, but being a one way valve can't it create a vacuum at one point?
     
  18. Mar 20, 2014 at 9:23 AM
    #358
    David K

    David K [OP] Well-Known Member

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    Differential Breather Mod Light Bar: 2 Hella 4000 HID, 1 Kragen HID, 1 Cibie Halogen.
    NO! The front breather is fine... it is the model we use for the back in this mod!!!

    That's one of the things that makes it seem so crazy that Toyota does... the good (2-way) breather in front, and a one way exhaust valve on the back!
     
  19. Mar 21, 2014 at 5:37 AM
    #359
    jtacoma1

    jtacoma1 Member

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    Understand. Thanks for taking the time to answer.
     
  20. Mar 25, 2014 at 10:46 AM
    #360
    David K

    David K [OP] Well-Known Member

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    Differential Breather Mod Light Bar: 2 Hella 4000 HID, 1 Kragen HID, 1 Cibie Halogen.
    No problem... anytime!
     
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