Hello
You have 4 drain plugs and a filter.one drain plug on the transmission , one on the drop box ere the 4X4 shaft comes out.On the rear you have 2 more , one on each finial drive housing. They take a 14MM wrench.You also have a filter that is cleanable.It is located on the side of the rear end housing under the left hand step. You will see a small cover with 2 12MM head bolts. Remove cover and spring and pull filter out.
Good Luck Lance