I am taking off my D18 T/C and there is no cotter pin holding the SM420 shaft in place like it said in the service manual. Is that because it is attached to an SM420 instead of a standard jeep tranny? Do I need to add one when I reinstall the T/C? On a related yet dumber note, I obviously drained the oil from the T/C before I got to this point, but I didn’t pay attention to which plugs went where. There is a large square bolt and a smaller square bolt, both of which look like they have the same thread. Which one goes in the fill hole and which in the drain hole? Thanks.