Mobil 1 has a full synthetic ATF, not sure exactly what name on bottle is, but you will know it is Mobil 1.
Autozone and Wal-Mart should stock it. It exceeds all specs for Dex III, Mercon 5 , and Chrysler +3 and uses all fully synthetic base stocks.
Does awesome with heat and low temp flowing.
I used it in a 91 Caprice with a 700-R4 that had a shudder problem.
I always use it anywhere that regular ATF is called for.
Mark