The pumps last a long time, so Id just say fill it up and try it out. Supras aslo have a problem where the rack seals go bad and they leak oil. I have that. But if not, the most obvious place to look for squealing is the belts. And if your car doesnt spin wheels if you put it in drive and floor it, I would say dont try any other way, cause odds are, its probably bad for your transmission.