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Rear diff breather mod question

Discussion in '3rd Gen. Tacomas (2016+)' started by stevebates, Jul 11, 2020.

  1. Jul 11, 2020 at 10:00 AM
    #1
    stevebates

    stevebates [OP] Active Member

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    Hi all - I did this mod with a hitch. I replaced the new diff adapter. The new unit goes all the way in but does not tighten. It also now will not backout. Could I apply jb weld around it for a seal? If that is not a good idea what are some recommendations for my situation.

    Thanks

    steve
     
  2. Jul 11, 2020 at 10:07 AM
    #2
    tirediron

    tirediron Well-Known Member

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    You could, but that's not what I would recommend. Why doesn't the existing fitting tighten and why won't it "un-thread" from the diff? Is it incorrect thread, damage, or? I would get the old one out, even if means pulling the pumpkin to do it.
     
  3. Jul 11, 2020 at 11:04 AM
    #3
    stevebates

    stevebates [OP] Active Member

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    The oem part number I bought was union 90404-51319. Attached is a pic of the bag the replacement unit came in. Also attached is a pic of the adapter I took out. I have a 2017 tacoma. It did not thread in funny or tight or akward. It went in with the same force that the old one came out.....

    6BA842FC-540D-43C3-9D4A-7B2B923144A4.jpg
    image.jpg
     
  4. Jul 11, 2020 at 11:37 AM
    #4
    pinem56

    pinem56 Well-Known Member

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    You stripped the threads on the new union. The new part is aluminum, and is relatively soft metal compared to the old part, which is steel. I did the same thing the first time I installed the new union. I was able to get it back out, and bought a second one to replace it. FYI, stripping the threads on the new union did not damage the threads on the diff housing.

    The part can't be threaded in all the way to the flange without stripping the threads, as it is taper threaded, and not originally made to fit specifically this diff housing. The thread pitch and taper is correct though, just not the length.

    I would keep trying to unthread it out while pulling on it, and hopefully the part will eventually come out. Just watch the torque more carefully with the second part/attempt, and you should be fine.
     
  5. Jul 11, 2020 at 11:40 AM
    #5
    boston23

    boston23 Well-Known Member

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    A heat gun could help loosen a seized bolt
    Possible hit it with some pb blaster

    Ive read the best anti seize is 50/50 acetone and automatic trans fluid
     
  6. Jul 11, 2020 at 11:40 AM
    #6
    tirediron

    tirediron Well-Known Member

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    Not sure of the part number, but given that is a tapered thread by the look of it, the fact that it won't tighten would really make me wonder. Can you get a lever or something between the hex and the dif housing to lift up on and see if you can get the thread to catch that way?
     
  7. Jul 11, 2020 at 11:40 AM
    #7
    tirediron

    tirediron Well-Known Member

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    OFFS - aluminum???? Really????
     
  8. Jul 11, 2020 at 11:42 AM
    #8
    Natetroknot

    Natetroknot Experiencing TW at several WTFs per thread

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    Cinch a vise grip on the top edge of the breather just enough to get a good grip on her, then pull up as you turn to back it out of the diff. It'll come out

    Put your wrench on the hex of the breather before the vise grip
     
  9. Jul 11, 2020 at 11:46 AM
    #9
    stevebates

    stevebates [OP] Active Member

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    Well that makes sense now. Thanks for the reply. Much appreciated!!! To hot in San Diego today to do anything so it makes for a good day to work on getting that thing out :) How much did you leave out on the replacement unit as far as threads? Because it is not tightened completely did you put some lock tight on the replacement unit?


     
  10. Jul 11, 2020 at 11:53 AM
    #10
    stevebates

    stevebates [OP] Active Member

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    yep yep!!!! That was my next plan :). So cool to have a place to come to bounce ideas off of when at a deadend. Thanks all for the help and input!!!


     
    Natetroknot likes this.
  11. Jul 11, 2020 at 5:16 PM
    #11
    pinem56

    pinem56 Well-Known Member

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    Going off memory, maybe 1/16th to 1/32nd of a inch. Just snug it down until there is some increased resistance. There really is no reason to torque on it. Wrap threads with teflon tape, if you want to overthink it.
     

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