Conversation Between '02strokerpilot and billyray09

2002 F-350 7.3 Liter......Need help.... sitting in driver seat- hearing loud high pitch noise that sounds like air noise. Only happens above 200rpms and stays constant until you back off gas and rpms drop. Can accelerate slow or normal and can run 65mph with no noise . The second you accelerate noise starts it sounds like it's coming between the radio glovebox at the firewall. Am guessing turbo but do have power just noise. Your thoughts please . Can also sit in park and rev to 3000 rpms with no noise at all. Only when you put a load on motor does it start. Blowing no smoke. Any suggestions. The noise has similar pitch as slipping belt but that's not the problem.