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Transmission Fluid Compatibility

Discussion in '1st Gen. Tacomas (1995-2004)' started by tacofan248, Jan 24, 2023.

  1. Jan 24, 2023 at 8:37 PM
    #1
    tacofan248

    tacofan248 [OP] Well-Known Member

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    Hey everyone

    Accidentally drained and filled transmission fluid with TYPE IV. 2002 Tacoma 2.7 Pre Runner. Manual says Dex II or Dex III.

    Is TYPE IV backwards compatible? Should I go buy Dex 3 and re drain and fill? Don’t want transmission to give out.

    Please lmk. Thanks in advance
     
  2. Jan 24, 2023 at 8:53 PM
    #2
    YotaGangYotaGang

    YotaGangYotaGang PreRunners are wannabe 4x4’s

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    I think you should be good it essentially is an updated version. Il say it on the bottle in small words. But if I were you id put valvoline sybthetic and a magnefine filter and add a scangauge to monitor temps. I did this and this stop lped my hard shifts when it was cold
     
  3. Jan 24, 2023 at 9:26 PM
    #3
    Chuy

    Chuy Well-Known Member

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    The bottle should state it’s compatibility. If not, look for the product’s data sheet.
     
  4. Jan 25, 2023 at 4:18 AM
    #4
    Bivouac

    Bivouac Well-Known Member

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    Yes the next generation of fluid needs to be back ward compatible.

    As the former fluid is no longer produced.
     
  5. Jan 25, 2023 at 6:26 AM
    #5
    Itsgottabeyourbull

    Itsgottabeyourbull Well-Known Member

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    Look on the label and see if it lists DEX iii and if it does you’re safe. If it doesn’t you will need to drain and refill. Oil is forgiving that you put the wrong product in and it won’t cause your transmission to blow but nothing something you’ll want to run for 20K miles on.
     
  6. Jan 25, 2023 at 6:29 AM
    #6
    Clearwater Bill

    Clearwater Bill Sometimes when I close my eyes, I can't see.

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    DEX VI is the latest DEX product AFAIK. III hasn't been made in years.

    I think you'll find T IV is just fine.

    I think @Crom did a trans fluid write up once. Maybe he'll swing by and chime in.
     
    Bivouac likes this.

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