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transmission fluid

Discussion in 'Bronco II' started by Doug 66, November 23, 2013.

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  1. Doug 66

    Doug 66 New Member

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    I was wondering what type of transmission fluid my sons 1990 bronco 2 takes . the guys at advanced auto said mercon v I didn't think that was around in 1990
     
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  3. 4x4junkie

    4x4junkie Well-Known Member

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    Assuming it has the Mitsubishi FM146 trans (which is most likely), it's specs call for 80W gear oil (GL-4).

    You are correct, Mercon V didn't come about until around '95 or so if I recall right. My experience has been not to use it in anything that doesn't explicitly call for it even though Ford now wants everyone to believe it's fully backward-compatible with Mercon... Seems it's too slippery for the synchros in the M5OD manual, and causes hard shifting.

    Mercon fluid is now called "Dex/Merc" or "Multi-Vehicle ATF" because of this. If you do happen to have the M5OD, this is what to look for (applies for '07 & older models w/M5OD).
     

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