One problem related to axle assembly has been reported for the 2004 Saturn ION. The most recently reported issues are listed below.
When I accelerate on highway the car does not pick up speed, it bucks then pushes itself. The engine is very loud. Sounds like grinding or whirring. They have had to calibrate the vehicle 2 times in the 3 months I have had this car. It is in the shop again today. (3rd time).