I found some "Valvoline Import Multi-Vehile Full Synthetic ATF" at O'Riely's that was about $6 a quart. I used it because it said right on the back of the bottle that is was compatable with JWS 3309 and a lot of other ATF's.
I dropped the drain plug on the trans and drained out a tad less than two quarts was all. No dip stick just a fill hole like a transfer case so I just put back in two quarts. After several weeks of driving it has always shifted fine. I believe I will change it this way about one a year.