Harsh Upshift
WARNING: This page is about a different car, the 2002 Dodge Intrepid, 2002 Chrysler Intrepid, 2002 Chrysler Concorde, and 2002 Chrysler 300M. However, it is still accessible from the selected car via links, so may be relevant.
Possible cause: incorrect hydraulic pressure, improper engine performance, leaking clutch or accumulator seals, burnt oil, worn or faulty overdrive clutch or worn or faulty 2-4 clutch.