Finally, I got more info on steering wheel shake . I still have this problem only tried conventional [4] wheel balance so far . "in some affected vehicles , there may be insufficient torque on the lock ring that secures the steering gear yoke plug. This condition has no affect on steering effort or directional control.Driver symptoms are confined to a rattle and vibration during parking or while driving on rough roads . The other bulletin I found regarding this issue is body mounts {TSB98-1-11}2003 & 2004 cv gm vehicles may exhibit a steering nibble above 44mph .Steering nibble is described as a slight rotational back and forth movement of the steering wheel. tsb for road force balance is 02-1-6 hope this helps I will post my results asap