Please add your year and model to your signature in the future. It would help greatly had you mentioned which you have to determine the correct transmission.
Although..you are replacing the 4th clutch shaft which typically does not wear out in the 4T60, and does in the 4T65
Here'* the valve body checkball location from the FSM
I know there'* more on another side. Here'* a link to a friends rebuild thread where everything is labeled and mentioned.
BonnevillePRO.com • View topic - Rebuilding a 4T65E-HD