Well after installing my Hydroboost last year I was plagued with aggravating power steering whine. In one of my threads I recieved a suggestion from PowerbrakeBob to switch to Dextron 3 instead of regular power steering fluid. It worked great. After flushing the system several times, it is as quiet as I had hoped. I just thought I would throw this out there for anyone suffering from the same problem. Nice and quiet now.