Thank you Transman for the details. That was more than i would have ever figured out on my own. So if I understand what you said It could be a needle bearing in/on the stator, Because the internals are not moving when stopped. Now i believe it was said that the pump is running all the time but it all sounds good when driving at speed so its most likely not the pump? I'm going to post a question in the truck section about what people are using for a replacement converter. Please feel free to comment on this issue or share what you are using for a converter.