I have a power steering setup off one of my mustangs. when i was driving it one day, the whole setup started making a weird loud noise as if i was running the system totally dry, but it was full. anyway, what im wondering is if it is hard to rebuild the entire setup? what is involved, can i get most of the parts and what would the parts cost ballpark? ive seen them advertise rebuilt ones where you have to trade yours in, but it would be nice if there were something cheaper.