What’s this plug for?

[mtshum]

Anyone know what’s this plug for?

[ex-x-fire]

Looks like a drain plug for the differential portion of the automatic trans. Some Toyotas had check plugs too.

[mtshum]

Do I have to open this drain plug too?

[ex-x-fire]

I was searching for an answer, I haven't found one yet. I guess if you do drain it there, make sure theres atf behind that plug, when you fill it through the trans dipstick tube.

[alanwagen]

Leave it alone unless you are ready to change your transmission fluid which can be tricky as the procedure has to do with oil temperature.