No, I don't know what RPMs the shop used to balance my drive shaft but whatever they used, it did not work. I was experiencing constant vibration when exceeding 80 MPH and only minor vibration under hard acceleration over 4000 RPMs. I got mines balanced yesterday, re-installed it as before, and now I have the vibration problem at 70 MPH. While I don't normally drive 80 MPH, I routine drive70-75 MPH. So, it's back to the shop Monday but quite frankly, I wonder if I need to get rid of this aluminum drive shaft all together.