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Transmission Drain Plug Leak

Discussion in '1st Gen. Tacomas (1995-2004)' started by FourandFuel, Oct 14, 2022.

  1. Oct 14, 2022 at 8:15 PM
    #1
    FourandFuel

    FourandFuel [OP] Well-Known Member

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    3" Icon lift 33" KO2 tires on 3rd Gen wheels
    The drain plug on my transmission is leaking. What can I do to fix this? I'm fairly certain the plug isn't stripped. This is a 99 5 spd with 4x4, 2 door, 2.7
     
  2. Oct 14, 2022 at 8:20 PM
    #2
    Kwikvette

    Kwikvette Chief Executive Officer at Kwik Fab

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    I'm not familiar with the manual in a Tacoma, but such plugs also use washers/crush gaskets that are meant for one-time use (just like the oil drain plug).

    I'd order a pack of them, pull the plug and just drain and fill while reinstalling the plug with said washer.
     
  3. Oct 14, 2022 at 8:21 PM
    #3
    FourandFuel

    FourandFuel [OP] Well-Known Member

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    3" Icon lift 33" KO2 tires on 3rd Gen wheels
    Where do I find said washers? I guarantee the missing Crusher washer is the issue.
     
  4. Oct 14, 2022 at 8:23 PM
    #4
    Kwikvette

    Kwikvette Chief Executive Officer at Kwik Fab

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    Toyota Parts store online (McGeorge is one often used)

    Amazon

    Any auto parts store (generic ones work, other brand vehicles use them)

    I have a bag of them myself but they're lost in the garage somewhere :rofl:

    They're available pretty much anywhere you'd buy an oil filter
     
  5. Oct 14, 2022 at 8:26 PM
    #5
    FourandFuel

    FourandFuel [OP] Well-Known Member

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    3" Icon lift 33" KO2 tires on 3rd Gen wheels
    Do you have any idea on the plug size?
     
  6. Oct 14, 2022 at 8:27 PM
    #6
    Kwikvette

    Kwikvette Chief Executive Officer at Kwik Fab

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    You'll see them pop up if you just add your vehicle info; have you gone that far yet?

    They'll pop up
     
  7. Oct 14, 2022 at 8:30 PM
    #7
    Black DOG Lila

    Black DOG Lila Well-Known Member

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    Stock. EZ pass.Dump pass.Inspection sticker.Convict printed lic.plates.FG cap.
  8. Oct 14, 2022 at 8:43 PM
    #8
    Kwikvette

    Kwikvette Chief Executive Officer at Kwik Fab

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  9. Oct 14, 2022 at 8:48 PM
    #9
    cone of shame

    cone of shame Member

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    Salt spray and rock chips.
    The size is 18mm, but don't get the pack of fiber washers from AutoZone, they never seal properly.

    Toyota sells this size crush washer in steel, aluminum, and copper (as seen in the kit linked above). I believe the transmission calls for aluminum washers -- BUT these are so cheap and it will be years before you need another one, there's really no need to guess or improvise or try to save money here. Galvanic corrosion sucks just as much as a perpetual fluid leak.
     
  10. Oct 14, 2022 at 9:11 PM
    #10
    cone of shame

    cone of shame Member

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    Salt spray and rock chips.
    Also make sure you don't have an old washer stuck on the plug, two is NOT better than one.
     
  11. Oct 14, 2022 at 9:13 PM
    #11
    Area51Runner

    Area51Runner Well-Known Member

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    EDIT: Updated with both MT and AT part#s. 15ftlbs for the drain pan plug (corrected, typo).

    R150 (MT) Drain/Filler plugs:
    90341A0002

    R150 (MT) Drain/Fill plug gasket:
    9043018008

    A340E/A340F (AT) Drain plug is:
    9034110011

    A340E/A340F (AT) Crush washers for trans drain plug are:
    3517830010

    When installing the crush washer for the 340E/F, you want to face the rounded side of the crush washer facing the pan.

    (Pictured: A340E/A340F crush washer)
    upload_2022-10-14_21-10-16.jpg
     
    Last edited: Nov 2, 2022
  12. Oct 27, 2022 at 5:19 PM
    #12
    FourandFuel

    FourandFuel [OP] Well-Known Member

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    1999 Tacoma 2.7, 2dr, 4x4, 5spd
    3" Icon lift 33" KO2 tires on 3rd Gen wheels
  13. Oct 27, 2022 at 6:26 PM
    #13
    Black DOG Lila

    Black DOG Lila Well-Known Member

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    Manual Transmission use Flat Copper.
    Tcase use flat aluminum
    Differentials use crush washers, smooth side in, slot out.
     
  14. Oct 27, 2022 at 9:21 PM
    #14
    Sicyota04

    Sicyota04 Slowly but surely.

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  15. Nov 1, 2022 at 1:37 PM
    #15
    cone of shame

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    Salt spray and rock chips.
    That listing says "cm" when it clearly should be "mm". It makes my skin crawl and makes me not particularly trust the seller.

    This is a lot of heartache to avoid calling the dealer's parts desk.
     
  16. Nov 1, 2022 at 2:39 PM
    #16
    Timmah!

    Timmah! Well-Known Member

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    The torque value for the automatic transmission drain pan bolt is 15 ft-lbs. At 27 ft-lbs, I'd imagine you'd either strip it or come very close to stripping it. That's a pretty small bolt.
     
    Madjik_Man likes this.
  17. Jan 14, 2024 at 9:24 AM
    #17
    Mongo1958

    Mongo1958 Well-Known Member

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    What? Is this for the trany crush washer? That explains the drop of oil on the bolt. Where does it say to do that. Is it tribal knowledge or is it published somewhere?
    Oh, well I get to do another drain and fill. Dang!
     

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