The front passenger side axle can wear, and the tri-pod bearing is known to fail. Vibration can be felt from the passenger side when the axle becomes worn.
Car Problem Reports
Saab 9-5 Vibration From Passenger Side on Acceleration
Saab 9-5 Problem
Drive Train Affected: 2.3L 4 Cylinder Turbo
Visitor, 2001 Saab 9-5, 73,000 mi
My saab starts to vibrate around 65 mph . had the tires rotated and balanced twice but still persists. has new rims and recent tires but still vibrates and it`s driving me crazy