What should I use for my k-planes. If I recall it said SAE-30 on the pump. That sound right?

What about trim pumps? Can you use SAE-30 there too?

I use power steering fluid in my tabs and trip pump. I also know of people using ATF in theirs. Only difference between those is the red dye and a little more detergents in the ATF

ATF all the way !!!!!!!!!!!!!!!!!!!!

If I want to change from the SAE30 that's in there now to ATF or PS fluid what should I do.

I know I can take the reservoirs off and clean them out. What about flushing the lines? Is that necessary?