GM Service Manual Online
For 1990-2009 cars only

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