The S-O-S transmission goes to park when the engine is not running.
The traction disconnect is on the left side inspection cover near the footboard. Your manual will instruct you as to how to disengage the driveline.
DO NOT attempt to remove the transmission top cover or disassemble the shifter until you have read and understood the procedures for doing so in a proper S-O-S service manual. Doing so can result in very expensive damage.