Ok I know you shouldnt use ATF in your power steering box but it works in a pinch. Why? Does it foam? Totally different propertys? Just looking for a quick explaination to the facts. Parts stores were closed Sun when I finished putting the box on and didnt think prior to doing the job so I filled it up with ATF when I was done and now it doesnt work as well. I guess I could think of it as a way to flush the system .