1994 4runner auto transmission fluid question

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I have a question about the auto tranny fluid in my 94 4runner .As i am finding out my 4runner wasnt too well maintained .It wasnt drove really hard but wasnt maintained very good .It has 147,000 miles and i dont know if the tranny fluid has been changed at all in all the miles of its life .I was going to change it and a mechanic friend of mine told me to get on here and ask someone if they had any problems out of a tranny that hasnt been changed at all in a long time and then changed .He said on some vehicles when this happens it causes some tranny operation issues .I bought a case of dextron 3 from the local autozone and i am waiting till i find out for sure what the skinnny is in this topic .I have done quite a bit of maintinence on this vehicle so far from oil change ,plugs,timing belt .front and rear diff fluids.If not the auto tranny fluid what next ?By the way my 4 runner is a 3.0 v6 2wd thanks for any input .Ron