Keep in mind that when you go from a standard universal style driveshaft to a CV style the required driveline angles are very different. For the universal style the transfer case and differential flanges should be parallel with each other. The goal is to have the angles at each end of the shaft equal. With a CV style you want the differential flange to point directly at the transfer case flange so the only angle is on the CV end of the shaft. If you don't get this right then having a balanced shaft won't matter.
