If that is a view from the top, as I think it is, then the lower gears don't slide. (I've not had my tranny that far apart, so don't recognize the view.). I would turn the cover over and play with it to understand how and what moves, and then play with the tranny to move everything into neutral. You will see shifter "forks" that grab the sliders, and those are what you want to move to find a point where nothing is engaged.