Inaccurate Shift Points

4L60-E AUTOMATIC TRANSMISSION

1. Oil pump assembly has stuck pressure regulator valve or sticking pump slide.

2. Valve body assembly has incorrect, damaged or incorrectly assembled
spacer plate or gaskets.

3. Case has the following conditions:

a. Porous or damaged valve body pad.

b. 2-4 servo assembly has damaged servo piston seals, improper length or damaged apply pin, or accumulator porosity.

c. 2-4 band assembly is burned or anchor pin is not engaged.

4. Throttle position sensor is disconnected or damaged.

5. Vehicle speed sensor is disconnected or damaged.

6. Four wheel drive low switch is disconnected or damaged.