As I was driving through Neveda last week I experienced some long hot inclines. At about 70 MPH at about 3k RPM and up I'd hear a grinding type noise. Sounds kind of like a ball bearing or something. I could get it to stop if I peddle it and go to a lower RPM and it would come on when I turn OD off and it would downshift. Anyone experience this or could point me in the right direction through that info? I can recreate it so I might get someone to drive out with me.