Ok so some of you know that I recently installed a new pro motion trans. Than I developed a serious vibration. It was my HB. I have since noticed a vibration in the shifter and seat of my pants. It is mainly under power or higher speed. Push in the clutch and it goes away. So it's not my DS. It's a tight vibration and can't tell if it speeds up or down w/ RPM. I just notice it when I am WOT or in fifth at 80 mph not at 75 but it starts at 80. Any sugg.? Clutch?