Low-Reverse Clutch
WARNING: This page is about a different car, the 2002 Dodge Intrepid, 2002 Chrysler Intrepid, 2002 Chrysler Concorde, and 2002 Chrysler 300M. However, it is still accessible from the selected car via links, so may be relevant.
Apply air pressure to LR clutch passage on adapter plate. Ensure low-reverse clutch piston moves forward and returns to original position when air is released.