To drain the fluid there are drain plugs on the transmission and transfer case, I still had quite a bit of oil in my transmission so you may get a mess when separating the units. There is a bolt that goes in from the front of the transmission into the transfer case, just to passenger side be sure to remove it.The two may be removed as a single unit but it's harder to maneuver it out of the hole and much heavier. ( or if you have the equipment you can drop it under after removing the shifters)