Difficult To System Balance The Driveline

If after following the Vibration Analysis - Driveline table you were instructed to system balance the driveline and you experienced difficulty in doing so while carefully following the procedures indicated (the EVA strobe readings seem to keep changing), then the axle differential to which the driveshaft is attached should be suspected to have internal problems which are being transmitted to the driveshaft. See FRONT DIFFERENTIAL ASSEMBLY  under DIAGNOSTIC STARTING POINT, or REAR DIFFERENTIAL ASSEMBLY under TROUBLE SHOOTING in appropriate DRIVELINE/AXLES article, for internal axle diagnostics.