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Diff Breather Mod Inquiry

Discussion in 'Technical Chat' started by Mon Leb, Jun 21, 2009.

  1. Jun 21, 2009 at 5:43 PM
    #1
    Mon Leb

    Mon Leb [OP] Tacoma's Quest!

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    Hi everyone!
    I want to do the diff breather mod on my truck but found a little discrepancy. PiercedTiger calls for the union fitting #90404-51319.
    http://www.tacomaworld.com/forum/technical-chat/4838-cheap-free-mods-3.html (at about 3/4 of the page, see Rear Differential Breather Relocation).
    Neubs calls #90404-51026 for the same part.
    http://www.tacomaworld.com/forum/2nd-gen-tacomas/15686-diff-breather-mod-dummies-pics.html
    Although both are calling for the same breather union (#90930-03136), which union fitting is the right one for my Taco 09?

    Best regards
    ML.
     
  2. Jun 27, 2009 at 6:15 PM
    #2
    Mon Leb

    Mon Leb [OP] Tacoma's Quest!

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    Chromed Bull-Bar Westin. Sport pedals. Round side steps bars. Stainless Steel Exhaust Tip 4WD Switch Light Mod Door Sill Protectors
  3. Jun 28, 2009 at 7:38 AM
    #3
    RCBS

    RCBS "Cause I'm mighty proud of that ragged old flag."

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    you can just go to a local plumbing or hardware store and get (1) 1/8" NPT female X 1/4" hose barb and (1) 1/8" NPT male X 1/4" barb. (1) 5' piece of 1/4" hose. i think it cost me all of $6.50. you can re-use the stock breather vent if you go this route.
     
  4. Jun 28, 2009 at 9:16 AM
    #4
    Janster

    Janster Old & Forgetful

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    The most important thing in that whole process, is getting a knurled fitting (or union) that will thread into the diff. The threads is what's important.
    Everything else is adaptable. The hose, and hose clamps are easily changable to fit.

    As RCBS already mentioned, you can re-use the old breather if you want. Make sure its not clogged (breathe through it and make sure it'll pass air).
     
  5. Jun 28, 2009 at 3:35 PM
    #5
    RCBS

    RCBS "Cause I'm mighty proud of that ragged old flag."

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    the thread pitch is 1/8"-27 national pipe. 27 threads per inch of length. pipe fittings are actually larger in real diameter than 1/8". O.D. is right around 5/16" on 1/8" diameter thread. i don't know why it's this way, other than to confuse things.

    don't forget your locker breather tube, if you have one. you can use a barbed tee fitting to hook it right into your differential's new hose.
     
  6. May 9, 2015 at 2:05 PM
    #6
    george3

    george3 Well-Known Member

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    I have the 90404-51319 but it doesn't thread into the diff. I would think it would be metric not NPT. Does anyone know what tap I should be looking at ? Thanks for any reply.
     
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