1-3 Clutch Assembly
WARNING: This page is about a different car, the 2010 GMC Sierra and 2010 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
13 clutch fluid pressure is exhausted from the center support assembly, allowing 1-3 clutch spring force to move the 1-3 clutch piston and release the 1-3 clutch plates.