Through my research I’ve run across a few very helpful documents regarding the trailblazer transmission (the 4L60e). I’ve amassed them here.
Electronic Controls Document:
Details of the internal wiring, pin-outs, and other electronic details.
(Left is the key document, right is the actual schematic file)
Details of the internal hydraulic routing and their functions.
Transmission Overhaul Detail:
Factory detail of a complete transmission overhaul.
Conversion to Manual Shift:
An interesting article detailing how to convert an eletronically controlled 4L60e into a manually-shifted transmission.