if u look threw the fender it will be slam in front of u.
if u look in the pic the ratchet is on the drain plug. the u can see the 1" plug that will read for fill.
The one with the 3/8 drive square in it is not the fluid check plug, it is for the snap ring that holds the case to the gear set. The fluid check plug is a 17mm beside the passenger side axle on the fire wall side... not shown in this picture.