[jnaas2]

That is a regular shower drain that is normally used but 2 inches down that is a fernco if you loosen up the clamps that small piece of pipe and the remainder of the shower will come out. I have attached a picture of how the drain connects to the shower to help you. You need to take measurements to the center of the existing drain to see how much trouble it will be to install a new shower base and if the drain will need to be moved. The one thing to remember is that this is on a second floor and if this shower leaks how much damage is it going to do? If your not comfortable, call a plumber out he or she can set it and give you peace of mind and you can finish up the tile work