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DIY: Rear Differential Breather Mod

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

  1. May 25, 2016 at 9:51 AM
    #1
    csuviper

    csuviper [OP] Moderator Staff Member

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    Brian
    Broomfield, CO
    Vehicle:
    2019 TRD Sport CM 5.7L 4X4
    Some Mods :) See build thread for details
    Tools needed:
    • 14mm wrench
    • Torx bit - T30
    • Dykes (diagonal cutting plyers)
    • Philips screwdriver
    • Drill

    Required parts:
    • Union: Amazon link. Can also get from the dealer. Part # 90404-51319 ~$12
    • ~6ft of 5/16" or 3/8" hose from local auto parts store (transmission oil cooler hose, fuel hose, pressure tube, etc)
    • 2 Hose Clamps
    • Zip Ties
    Optional parts:
    • New breather Part # 90930-03136

    Instructions
    1. Drop down and remove the spare tire.
    2. Remove the stock breather with 14mm wrench.
    3. Install union.
    4. Push new hose onto the union.
    5. Add hose clamp at union.
    6. Run the hose up to the bed following the brake lines.
    7. Zip tie the hose to the brake lines and frame as desired. Remember to leave enough extra for when the suspension droops down.
    8. Route the hose to desired location for the breather. Some has placed them in the gas cap compartment or bed. If needed you will have to drill a hole to feed the hose into these locations.
    9. Install breather and hose clamp in desired location. Secure as needed.



    Before pic of the breather:


    After the union and hose are installed:


    Here is the union and breather parts from the dealer (not my pic):


    Here is the hose i got:


    Comparison of the breather and the union:
     
    Last edited: Aug 23, 2019
    The Dude, TTund16, YardBird and 17 others like this.
  2. May 25, 2016 at 10:00 AM
    #2
    dcsleeper408

    dcsleeper408 BASTRDS

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    mark
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    So here is a quick little write up for the diff breather mod.
    -Diff is hot, when you cross cool water it will vacuum that mud/water into your diff=costly repair. great $20 insurance plan.-

    I used 5/16 fuel line 12ft ish depending on how you decide to route.
    2 hose clamps
    teflon tape
    bunch of zip ties
    Cutters,pliers, star socket for the tails(forgot what size)

    E2887FEB-4EC1-4E83-AE05-5E57D54F7419_zps_585b42c8be6c7863a423b02ee05dfa2b48801065.jpg
    i used part # 90930-03136 and part # 90404-51319

    First remove your tail light/disconnect all the plugs and put aside(2 star screws+pins that you need to pull away from to remove). Look down inside and see where you would route the line. Look towards the top of the bed and see where you would like to mount the new breather on. Make sure breather is pointed upward(highest point possible.)

    BE58F6C7-2A7F-4843-90F9-AFD270DFB190_zps_5bea8f7208587d51e3c54d84891824e165a51e57.jpg

    This is the new adapter and old breather
    E16AA888-46C9-4A65-80DC-47B7143C03D3_zps_328d38c44c54a0e6ab8eac4f580ae6a1a19beb11.jpg

    New adapter mounted(teflon tape the threads)
    E16AA888-46C9-4A65-80DC-47B7143C03D3_zps_328d38c44c54a0e6ab8eac4f580ae6a1a19beb11.jpg

    fuel line connected to new adapter,clamp and be sure to leave a good amount of slack for Flex.
    2A06D28B-B93C-401D-932D-A5F49EE46018_zps_804c34c718cf91cc55801f0d5fd8b7a00f81af70.jpg


    I ran the line above the frame zip tied green so I can easily distinguish the breather line. then went along the frame up into the taillight section.
    2A58F884-4D85-4115-BDE4-337C70B2A5B8_zps_f6d87970cbcd19718917988d8d6f4072d1023555.jpg

    D387E7C9-F5FC-48F5-A350-010366F2AEFF_zps_28b7b979a653dcb9ab981aa7d2d98b493b0318e1.jpg

    2643458D-9987-4038-92A3-69CBBC8CB0AE_zps_d4f582bcc9906f1c331107f5351db5083265fedc.jpg

    913661AA-1988-4AC7-8E17-F466051DFD41_zps_b88a5a8374b3dd4bc5a9d864acb768f6f3db85aa.jpg
    Then mount the new breather in clamp it ,clip all the excess fuel line, zip ties, and put everything back together.
    Really easy mod. I seen countless threads where ppl run clear fuel filter through. you can if you want to. I honestly don't see the point unless you want to see if you would get any "blow back"?
    But I opted to this simple.. just like our front breathers.

    here is a video of my taco running through a small river. I didn't have the diff breather on at the time on the taco, drained the fluid. and luckily no water mixed in.. but now breather is in the taco and tundra for peace of mind just in case situations like this occurs again.

    https://www.youtube.com/watch?v=CoUQUh1p--0
     
  3. May 25, 2016 at 10:10 AM
    #3
    csuviper

    csuviper [OP] Moderator Staff Member

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    Some Mods :) See build thread for details
    Copied here: https://www.tundras.com/threads/diy-rear-differential-breather-mod.5253/

    If i would have known you already had it written up or where going to then i would have let you create the DIY, not me.
     
  4. May 25, 2016 at 10:28 AM
    #4
    dcsleeper408

    dcsleeper408 BASTRDS

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    hah all good. your pictures are better.
     
  5. May 26, 2016 at 11:53 AM
    #5
    riksidney

    riksidney New Member

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    dcsleeper408 likes this.
  6. May 26, 2016 at 12:12 PM
    #6
    csuviper

    csuviper [OP] Moderator Staff Member

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    Some Mods :) See build thread for details
    I am reusing the existing one. It fits in the hose just fine.
     
    dcsleeper408 likes this.
  7. May 26, 2016 at 1:58 PM
    #7
    Spvrtan

    Spvrtan Amateur fabricator

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    ..I forgot but does our front need a breather, too?
     
    dcsleeper408 likes this.
  8. May 26, 2016 at 2:01 PM
    #8
    csuviper

    csuviper [OP] Moderator Staff Member

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    Some Mods :) See build thread for details
    equin, MotoTundra and dcsleeper408 like this.
  9. May 26, 2016 at 5:53 PM
    #9
    15whtrd

    15whtrd Mr. Blonde

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    White 2015 Tundra DC SR5 TRD 4x4 5.7L, White 2003 Sequoia 2WD
    TRD Pro suspension, +2 Coachbuilder shackles, 2015 TRD Pro headlights, 20% ceramic tinted windows, clear ceramic tinted front windshield, aFe drop in pro s dry air filter, TRD airflow accelerator, TRD oil fill cap, TRD 18 psi radiator cap, BDX Bullydog tuner, Weathertech floor mats front and rear, rear seat fold down mod, DNA hard trifold tonneau cover, Linex with uv protection, TRD rear swaybar, TRD center caps, TRD Pro grille insert with color matching surround and bulge, TRD PRO headlights, aluminum oil filter canister, Real truck tailgate seal, Pop-n-lock tailgate lock actuator, rear diff breather relocate, RCI front skid plate. 275/70 R18 BFG KO2s
    Next on the to do list!
     
    Inquiringone and nlaroy like this.
  10. May 26, 2016 at 7:00 PM
    #10
    IndyTundra

    IndyTundra Did someone say beer?

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    Ordered the union today. Thanks for posting this.
     
    dcsleeper408 likes this.
  11. May 26, 2016 at 7:07 PM
    #11
    CaptTyler

    CaptTyler Life’s too short to have an ugly boat.

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    Ya I love little mods like this. I'm going to make this my weekend project.
     
  12. May 27, 2016 at 8:18 AM
    #12
    dcsleeper408

    dcsleeper408 BASTRDS

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    20 minute job! 30 minutes with a couple cold ones.
     
  13. May 27, 2016 at 11:39 AM
    #13
    Tracker

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  14. Jun 21, 2016 at 9:02 PM
    #14
    Tracker

    Tracker New Member

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    Just ordered up the parts!
     
  15. Jun 22, 2016 at 2:16 PM
    #15
    Tracker

    Tracker New Member

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    I went red to match my TRD sway bar
     
  16. Jun 25, 2016 at 10:41 AM
    #16
    Tracker

    Tracker New Member

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    Pretty good match to my sway bar. I'm just waiting for the rest of the stuff to come in.

    breather tube.jpg
     
  17. Jun 30, 2016 at 8:25 AM
    #17
    Tracker

    Tracker New Member

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    Union still hasn't arrived :(
     
  18. Jul 1, 2016 at 12:05 AM
    #18
    Tracker

    Tracker New Member

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    The Amazon link above
     
  19. Jul 14, 2016 at 10:26 AM
    #19
    bandit

    bandit New Member

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  20. Jul 14, 2016 at 2:35 PM
    #20
    bandit

    bandit New Member

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    No worries! glad to help! Post pics up after!
     
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  21. Jul 14, 2016 at 7:05 PM
    #21
    Black Wolf

    Black Wolf INCOGNITO undercover mafia

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    I got lazy and ordered the ARB version $50. Should take 20 minutes and one beer for install:

    170112_1.jpg


    Correction: $70 (68.40)
     
    Last edited: Jul 16, 2016
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  22. Jul 15, 2016 at 9:26 AM
    #22
    Black Wolf

    Black Wolf INCOGNITO undercover mafia

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    The ARB is just a fancy version of the diff mod discussed here which is quite good by the way. And mod is cheaper in cost. There really isn't a great advantage when used on our Tundra since Toyota positioned the transfer case breather and front diff breather high up. Not sure why Toyota dropped the ball on the rear diff. The ARB actually allows up to 4 breathers if you need them which we don't.
     
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  23. Jul 15, 2016 at 9:36 AM
    #23
    TheBeast

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    looks like you can hook up 4 breather lines on the ARB. Please post pictures when you install it. thanks.
     
  24. Jul 15, 2016 at 12:22 PM
    #24
    Black Wolf

    Black Wolf INCOGNITO undercover mafia

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    I'll post pics after I get it and yes I'll probably run it up to the tail light area. The DIY diff mod is really very good.
     
  25. Jul 15, 2016 at 8:01 PM
    #25
    Mike

    Mike Tread lightly.

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    yep bank account is running low from it..
    I will bite where you get it for 50.
     
  26. Jul 16, 2016 at 7:25 AM
    #26
    Black Wolf

    Black Wolf INCOGNITO undercover mafia

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    Typo. Should have $70.( Actually $68 and change.)
     
  27. Jul 16, 2016 at 8:30 AM
    #27
    Mike

    Mike Tread lightly.

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    Spoiler you.. you had me looking all over for it at 50 bucks..
     
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  28. Jul 16, 2016 at 9:06 AM
    #28
    bandit

    bandit New Member

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  29. Jul 16, 2016 at 9:29 AM
    #29
    Mike

    Mike Tread lightly.

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  30. Jul 16, 2016 at 9:30 AM
    #30
    bandit

    bandit New Member

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    Duh Tundra
    quick google search and they have a military discount too
     
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