So my parts bin Frankenstein monster of a minitruck has a steering system made up of components from 3 different cars. I have a C4 vette steering rack, Silverado PS pump and a 99-04 Mustang GT hydroboost. I haven't thought about this until now but it looks like the mustang uses Mercon LV ATF for PS fluid and the GM components use a standard PS fluid. Have any of you guys made mix matched systems like this? My initial thought is both ATF and PS fluid are basically hydraulic fluids so it shouldn't be an issue but is one better than the other?
