the right tranni fluid?

Should I mix the Dextron with the ATF +4 then? It's one quart.

No.....I would get a quart of Dexron II or Dexron III.

ATF+4 Is a synthetic. Doesn't make sense to mix it with Dexron. Plus it's like
$6.00 a quart. :-k

Now if you drained the entire trans/converter, that would be a different story.