Like Mark said above, buy 7 quarts of TOYOTA T-IV fluid and a couple crush washers at a Toyota dealer.
First change without dropping pan, run it 1-5 thousand miles, then drop pan and change fluid PLUS filter the second time.
Mine was so dirty I actually did a fluid only replacement 3 times at 1K miles before replacing the fluid and filter the 4th time.
Shifts like a new transmission again.
2003 Vibe Base / Frosty Mono / Moon & Tunes / Auto / Well equipped / 200k mi
2006 Vibe AWD / Lava Red Mono / Loaded w/Leather and Sport Pkg / 141k mi
Many other 2 & 4 wheel toys
39 years with a wonderful woman / 2 adult kids