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My Differential Breather Mod Photos

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

  1. Aug 20, 2013 at 9:52 PM
    #341
    David K

    David K [OP] Well-Known Member

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    Differential Breather Mod Light Bar: 2 Hella 4000 HID, 1 Cibie Halogen. Bilstein 5100s Ride Rite Air Bags
    See this photo, lower red square, by frogsauce:

    [​IMG]
     
  2. Aug 21, 2013 at 8:25 AM
    #342
    David K

    David K [OP] Well-Known Member

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    Differential Breather Mod Light Bar: 2 Hella 4000 HID, 1 Cibie Halogen. Bilstein 5100s Ride Rite Air Bags
    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.
     
  3. Aug 21, 2013 at 4:03 PM
    #343
    DoorDing

    DoorDing Intentionally obtuse

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    yes
    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?
     
  4. Aug 21, 2013 at 4:13 PM
    #344
    David K

    David K [OP] Well-Known Member

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    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?
     
  5. Aug 21, 2013 at 4:18 PM
    #345
    DoorDing

    DoorDing Intentionally obtuse

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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.
     
  6. Aug 21, 2013 at 4:32 PM
    #346
    David K

    David K [OP] Well-Known Member

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    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... ???
     
  7. Sep 18, 2013 at 5:45 AM
    #347
    Frogsauce

    Frogsauce Well-Known Member

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  8. Sep 28, 2013 at 12:09 AM
    #348
    David K

    David K [OP] Well-Known Member

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  9. Oct 4, 2013 at 9:38 AM
    #349
    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]
     
  10. Dec 26, 2013 at 9:26 PM
    #350
    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.
     
  11. Dec 27, 2013 at 3:27 PM
    #351
    David K

    David K [OP] Well-Known Member

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    Differential Breather Mod Light Bar: 2 Hella 4000 HID, 1 Cibie Halogen. Bilstein 5100s Ride Rite Air Bags
    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!
     
  12. Mar 19, 2014 at 5:22 PM
    #352
    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?
     
  13. Mar 20, 2014 at 9:23 AM
    #353
    David K

    David K [OP] Well-Known Member

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    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!
     
  14. Mar 21, 2014 at 5:37 AM
    #354
    jtacoma1

    jtacoma1 Member

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    Understand. Thanks for taking the time to answer.
     
  15. Mar 25, 2014 at 10:46 AM
    #355
    David K

    David K [OP] Well-Known Member

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    No problem... anytime!
     
  16. May 23, 2014 at 1:53 PM
    #356
    UTdez23

    UTdez23 Well-Known Member

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    Just finished this mod!! Thanks to everyone's tips and descriptions. Was super easy.

    [​IMG]

    [​IMG]

    [​IMG]
     
  17. May 24, 2014 at 11:10 AM
    #357
    David K

    David K [OP] Well-Known Member

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    GOOD JOB! New color tube looks great!
     
  18. May 24, 2014 at 10:02 PM
    #358
    UTdez23

    UTdez23 Well-Known Member

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    Thanks David! Yup, as advertised Lowes no longer carries the yellow high pressure hose, just the bright red/orange.. Thanks again for all the notes & pictures. Super helpful! It's a very useful & easy mod, now I can run through stream & river crossings with confidence! (While still using common sense :D )
     
  19. May 25, 2014 at 5:32 PM
    #359
    David K

    David K [OP] Well-Known Member

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    I know someone with a Toyota Land Cruiser that got his rear diff fluid water contaminated from just one time crossing a deep muddy creek, the same one that got me, in Baja, when my truck was new.

    DON'T DELAY, DO THE REAR DIFF BREATHER MOD TODAY!
     
  20. May 25, 2014 at 6:19 PM
    #360
    Agent Smith

    Agent Smith Always outnumbered, never outgunned

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    We had flash flooding here the other day and I had a few involuntary water crossings (on roads) up to my rockers. I had no worries with this mod, completed last summer.
     
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