Harsh Shift 4 to 5, or 5 to 4

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Check	Causes
DEFINITION: One of the two following conditions occurs during a 4th to 5th and 5th to 4th gear steady throttle upshift, or a 4th to 5th gear coast, or a light to moderate throttle detent downshift: Harsh shift feel - an unacceptable quick gear change occurs.
Overdrive Clutch and Coast Clutch	Damaged or cut piston Damaged or worn clutch plates
Fluid Pump Assembly	Pressure regulator valve stuck Pressure regulator valve spring Line boost valve spring Line boost valve or bushing stuck, damaged or incorrectly assembled Fluid pump screen assembly plugged or damaged Fluid pump rotor guide omitted or misassembled Fluid pump rotor cracked or broken Porosity in fluid pump Fluid pump surfaces not flat Excessive fluid pump rotor clearance Pump slide seal out of location Pump vanes damaged Pump slide spring damaged
Pressure Control Solenoid	Damaged