Can anybody tell me steps to changing out the shift solenoids in a 4l60e?

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It is not all that difficult. Wear some old clothes and a hat because you are going to get messy. Here you go:

Remove the transmission oil pan and filter. Important: Do not remove the valve body for the following procedures. Removal of the 1-2 accumulator is necessary only if servicing the pressure control solenoid.

Remove the 1-2 accumulator if necessary.

Disconnect the internal wiring harness electrical connectors from the following components:
Transmission fluid pressure switch
1-2 shift control solenoid
2-3 shift control solenoid
Pressure control solenoid
TCC PWM solenoid
3-2 control solenoid

Remove the pressure control solenoid retainer.

Remove the pressure control solenoid.

Remove the 1-2 and 2-3 shift solenoid retainers.

Remove the 1-2 and 2-3 shift solenoids

Remove the 3-2 control solenoid retainer.

Remove the 3-2 control solenoid.

To install:

Install the 3-2 control solenoid.

Install the 3-2 control solenoid retainer.

Install the 1-2 and 2-3 shift solenoids.

Install the 1-2 and 2-3 shift solenoid retainers

Install the pressure control solenoid. Ensure that the electrical tabs are facing outboard.

Install the pressure control solenoid retainer and retaining bolt.

Tighten the pressure control solenoid retaining bolt to 11 Nm (97 inch lbs.)

Connect the internal wiring harness electrical connectors to the following components:
Transmission fluid pressure switch
1-2 shift control solenoid
2-3 shift control solenoid
Pressure control solenoid
TCC PWM solenoid
3-2 control solenoid

Install the 1-2 accumulator.

Install the transmission oil pan and filter.

Fill the transmission to the proper level with DEXRON III
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