Is engine light on? If so could be the TCM (Transmission Control Module). Your vehicle is stuck in what is call LIMP MODE. Some models also have what is call a Turbine or Input Speed Sensor and an Output Speed Sensor. I don't remember if that year had them or not.
If engine light is not on then most likely it is an internal malfunction and it will need to be replaced or rebuilt.
Tuesday, January 26th, 2010 AT 7:27 PM