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Auto Trans question- 80-90 wt gear oil usage

Discussion in '1st Gen. Tacomas' started by MichaelL, Jun 18, 2013.

  1. MichaelL

    MichaelL [OP] Member

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    Hello-
    1997 tacoma, 2.4 L, extended cab, auto trans, 125K miles.

    80-90 weight gear oil was used when transmisson oil was was drained
    (app. 2 qts) . Drove about 10 miles and then drained again (2 qts) and added Napa Dexron 3 ATF.
    I was thinking about changing it again in about a week, but after cruising all over the web, it seems
    like it might be a waste of time as 80-90 wt valvoline gear oil seems like a good use in trannies for some folks.

    Does anyone have experience with this please?
    More than likely I will drain again in a week. It is so easy to do.
    Thanx
    Michael
    PS - will not get it flushed no matter what.
     
  2. obscurotron

    obscurotron Well-Known Member

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    80w-90 in an *automatic* transmission? That's…surprising.

    80w-90 usually runs in the 14-16 cSt range (100 celsius). Dexron-III ATF, by comparison, usually runs 7.4 to 7.7 cSt (also @ 100 celsius). You dropped something twice as thick (at or near max. operating temp) in your auto transmission as what it likely calls for. It called for water, and you added room temperature honey.


    I guess if it *works* for you, great. I'm not recommending it for a couple of reasons. One, it's not what the manufacturer calls out and the kinematic viscosity is all wrong. Second, there are additives, friction modifiers and detergents in even generic Dex-III that 80w-90 GLI 4/5 doesn't have. I'm not calling you stupid (because maybe you know something I don't), but I am calling you brave! ;)
     
    Last edited: Jun 19, 2013
  3. ARB1977

    ARB1977 Don't be a dick

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    You my friend just fawked up your transmission. Why on earth would you add gear oil to an automatic? Unless your drunk.
     
  4. 4x4yota

    4x4yota 4wd is awesome

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    80w-90 is SO much thicker than atf fluid. I wouldnt think it would be a good idea. But like the other guys said maybe u know something we dont so this is an occasion for popcorn
    :popcorn:
     
  5. x2468

    x2468 Well-Known Member

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    I would ask this on bobtheoilguy forum (google it). From my understanding its bad, you should probably flush the thing (via the radiator atf cooling system). Search diy atf flush.
     
  6. MowTaco

    MowTaco Well-Known Member

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    The same reason you'd put ATF in your coolant *cough Krazie cough*

    You sure the people running 80-90 had AUTO transmissions? Cause that's about what the 5-speed MANUAL calls for (I think I put 75-90 in mine, not sure)
     
    Last edited: Jun 19, 2013
  7. ARB1977

    ARB1977 Don't be a dick

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    Go back and read his question.
     
  8. MowTaco

    MowTaco Well-Known Member

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