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My Differential Breather Mod Photos

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

  1. Jan 20, 2013 at 1:48 PM
    #301
    Gabe911

    Gabe911 Well-Known Member

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  2. Jan 21, 2013 at 9:02 AM
    #302
    bkrdave36

    bkrdave36 Well-Known Member

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    Gabe 911 - Whats the switch for?
     
  3. Jan 21, 2013 at 1:24 PM
    #303
    Gabe911

    Gabe911 Well-Known Member

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    Guess the stock breather on my rear diff is only 1 way valve so I followed the OP's advice and switched it out for a 2 way with longer hose. Its suppose to help preserve the seals
     
  4. Jan 21, 2013 at 2:18 PM
    #304
    ImpulseRed008

    ImpulseRed008 Gone But Not Forgotten

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    pretty sure he's asking about the switch on the left side of the cubby... :popcorn:
     
  5. Jan 21, 2013 at 2:32 PM
    #305
    Gabe911

    Gabe911 Well-Known Member

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    LOL... sorry :)...The switch is for my bed lights I put in the smaller pocket cubby holes closer to the cab. pics should be in my sig
     
  6. Jan 21, 2013 at 2:32 PM
    #306
    BostonBilly

    BostonBilly Well-Known Member

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  7. Jan 23, 2013 at 8:46 AM
    #307
    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.

    Well, it prevents a vacuum from developing inside the differential so muddy water doesn't get sucked in when you cross a stream deeper than 18". This is the setup that Toyota does on the front differential, but failed to on the rear. It is the perhaps the easiest mod in the world and maybe the most important one any off roading Tacoma should have!
     
  8. Jan 23, 2013 at 10:14 AM
    #308
    T@co_Pr3runn3r

    T@co_Pr3runn3r XXXXXXXXXXXXXXXXXXX

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    It wouldn't hurt for them all to be that way...even the 5 luggers. People drive thru water deeper than 18" in the streets when it floods, lol.....or try to.
     
  9. Jan 23, 2013 at 7:06 PM
    #309
    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.
    Agreed! Other truck companies have extended breathers on the rear diff... why not Toyota? Thanks for extending the front differential up high, at least... half is better than none?!
     
  10. Jan 23, 2013 at 10:23 PM
    #310
    Sublime

    Sublime Well-Known Member

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    Is the rear breather even necessary? I've dunked the rear a few times recently and just changed the fluids and they looked fine.....could just regularly changing it be fine if I got into some dirty shit?

    Im just lazy and haven't found the need for the breather yet??
     
  11. Jan 24, 2013 at 9:07 AM
    #311
    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.
    What the Tacoma has on the rear differential (from the factory) is an exhaust valve that opens to relieve high pressure, although we all call it a 'breather'.

    By changing the exhaust valve to a true breather (the same kind Toyota puts on our front differential) you reduce the chance of mud contaminating the gears. The muddy water gets in past the axle seals because a vacuum is created when you quickly go from being hot to cold when you drive into a stream.

    It happened to my 6 month old Tacoma the first time I drove into a muddy creek... and had it's gear oil inspected after we got back from Baja. It was milky (water contaminated)... so changed the oil, right then.

    Next, I performed the mod, as shown in my photos on the first page of this thread, using the Toyota parts shown (breather and union) with the tube to place the breather up high in one of the bed compartments.

    Now, anytime I quickly cool the differential by driving into water, it can breath to break the vacuum and not suck in any mud or water. It also allows venting if over pressurized gas from the gear oil (just as the stock one did).

    That was almost 3 years ago, and haven't had an issue since!

    IF the factory does this kind of breather on the front differential, doesn't it make sense to do it on the rear??? YES!
     
  12. Jan 24, 2013 at 7:10 PM
    #312
    Sublime

    Sublime Well-Known Member

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    Makes sense....thanks!
     
  13. Jan 28, 2013 at 5:29 PM
    #313
    David K

    David K [OP] Well-Known Member

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    De nada!
     
  14. Jan 31, 2013 at 1:50 PM
    #314
    BostonBilly

    BostonBilly Well-Known Member

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    I ordered the parts this afternoon. I will get them after work, I just have to pick up the fuel line. Has anyone used the extra fuel line for the oil filter drain
     
  15. Feb 2, 2013 at 10:11 AM
    #315
    derrenwd

    derrenwd Member

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    is the breather the same place on the trd off roads 2005 ?
     
  16. Feb 2, 2013 at 11:48 AM
    #316
    Gabe911

    Gabe911 Well-Known Member

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    Yes
     
  17. Feb 2, 2013 at 12:00 PM
    #317
    fletch aka

    fletch aka www.BeLikeBrit.org

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  18. Feb 2, 2013 at 12:14 PM
    #318
    derrenwd

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  19. Feb 2, 2013 at 12:18 PM
    #319
    BostonBilly

    BostonBilly Well-Known Member

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    Wish you posted before I bought from Toyota. I looked local for the Brass 1/8" BSPT (British Standard Pipe Thread) no one had them
     
  20. Feb 4, 2013 at 10:03 AM
    #320
    cverneau

    cverneau Well-Known Member

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    Okay - I've read both of the major threads on this mod and will be doing this soon, but here's my confusion:

    Some people use union p/n 90404-51026 (1/4" barb) and this seems to thread down all the way to the nut.
    Some people use union p/n 90404-51319 (3/8" barb) and this seems to thread in but has quite a few threads still showing.
    Both of the above p/n's are metal and have 1/8" NPT threads and everyone's using teflon tape for installation.

    The poster above me has used a brass fitting with 1/8" BSPT threads with no problems. If the threads are BPST threads, then people using the 1/8" NPT fitting may run into problems down the road.

    In reading all of the postings with regards to this mod, the majority of people have no problems, but some have had the fittings not thread in correctly, not been able to tighten the fitting or they have been loose and wobbly, and in one case, not been able to remove the loose fitting after installing it.

    Everyone seems to have an opinion, due to what worked for them, but does anyone know - definitively - what the thread should be on this fitting and which part should be used??
     
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