AW3 has only 1 set of planetary gears, they never disengage, but there are 2 sets of driver pawls
one for high and the other for low, as you pull the indicator chain
you switch the purpose the planetary gears from overdrive to reduction gear.
direct is the one in the middle , so neither 4/3 or 3/4.
all else fails every repair part is available.. something Sram And Shimano have come up short on.