Transfer Case Output Shaft Seal Leak

What is your question?

I have a transfer case output shaft seal leak and so far Firestone nor Jeep can figure it out. I took it to a man that worked with Dodge for 11yrs and he works on cars in his spare time. He said the only thing he could think of is the companion flange (see pics). My transfer case was replaced less than 3yrs ago, not a factory replacement. I attached the pics, he said he has to get the part from Jeep...is this right? I have like four pics if you need to see them

What makes this problem better or worse?

Driving

How long has your 2005 Jeep Grand Cherokee had this problem?

Months