GM Service Manual Online
For 1990-2009 cars only

Inaccurate Shift Points

Checks

Causes

Oil Pump Assembly (4)

    • Stuck pressure regulator valve
    • Sticking pump slide

Valve Body Assembly (60)

Spacer plate or gaskets misassembled, damaged or incorrect

Case (103)

    • Porous or damaged valve body pad
    • 2-4 Servo Assembly
       - 2-4 accumulator porosity
       - Damaged servo piston seals
       - Apply pin damaged or improper length
    • 2-4 Band Assembly
       - Burned
       - Anchor pin not engaged

Throttle Position Sensor

    • Disconnected
    • Damage

Vehicle Speed Sensor (36)

    • Disconnected
    • Damaged
    • Bolt not tightened

4WD Low Switch

    • Disconnected
    • Damaged