Harsh Shift 4 to 5, or 5 to 4. Chevrolet Lumina Ute 2009

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2009 🢒 Lumina Ute 🢒 Transmission 🢒 Automatic Transmission - 5L40-E/5L50-E 🢒 Harsh Shift 4 to 5, or 5 to 4

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