Would have been a lot easier if the designer modified the shift cable hold-down bracket and bolt to get a 1/4 drive socket around it. Good thing the neighbors weren't home this afternoon. Lots of choice words issuing from under the truck.
Drained the fluid, added a fresh gallon, drove it a bit, then dropped the pan, cleaned up the black crud, changed the filter, added another gallon or so.....the fluid still stinks and looks like mud.
It's not mine so I have no idea of it's history.....82K on it