Latest trial and error....Rotated tires and had balance checked again with no luck! Will try disconnecting the D/S and rotating it 180 deg. and see what happens. Wanna put upgraded u-joints on anyways...Truth be known...I actually believe I have a bad T.C. and or O.D. solenoid...something along that line. It only happens in O.D....1500 rpm, and 45-50 mph.