GM Service Manual Online
For 1990-2009 cars only

Slips in Drive

Checks

Cause

Fluid Level

Low: correct

Vacuum Line

Pinched, slowing vacuum response

Modulator

Damaged

Oil Pressure

See causes of low pressure

Modulator Valve

Stuck or binding

Forward Servo Assembly

Damaged or missing cushion spring or retainer

Forward Servo Piston

Damaged seal

Oil Filter

Plugged

Filter Seal

Cut or damaged

Forward Servo Seal

    • Leaking, damaged, or missing seal
    • Low torque of bolts

Torque Converter

Stator roller clutch not holding

Bolt

Low torque allowing leakage for driven sprocket support

Input Clutch Assembly

    • Leaks at ball capsule or seals
    • Damaged seals

Pump Assembly

    • Sticking slide
    • Leak at the slide seals

1-2 Shift Solenoid, TCC solenoid

Malfunctioned or mislocated