I used Advance Auto Parts brand ps fluid. It states for Gm, Ford and Chrysler vehicles.
Personally, I would put the right stuff in there. It can be a pain to flush some systems, but if you can extend the return line to the reservoir, then it's not bad at all.
I have seen tons of comments where it's stated "Power steering fluid and ATF are the same." If that was true, then it would be fine to put PS fluid in an automatic transmission, but you won't find anyone recommending that.
I have also seen plenty of systems running the wrong fluid (PS vs ATF) and work fine. Does it really matter? It's a debate you will find tons of pages of discussion, but no clear cut answers. I have also seen systems running PS instead of ATF fail. Was it due to the wrong fluid? Who really knows.
For me, if I went through all of the hassle to change out the entire system, I wouldn't short cut the last step. If it turns out it does matter, and your system fails in a year or two, what have you gained? I run the recommended fluid, period.
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