np205 help

[beerbeer95648]

Cant win for trying. Every time I fix one thing, there is something else that pops up. Received this truck from my uncle a while back and have been slowly working through things. Went to change fluids today for the first time since I received it and noticed the transfer case only had 1/4 quart gear oil. Thought, that's weird and topped it up. Took it for a long drive and noticed a good size puddle of gear oil on the pavement under the transfer case. It looks like it is leaking from the idle shaft nut on the front of the case. When I grab the nut on the idle shaft I can move the whole assembly up and down more than 1/4", and there is oil all around and under the washer! Whats going on in there? Any advice? I have a video but cant get it to marry up with my computer...