Well had to replace my ADD last week, mine was shot. When I took it apart it had about 1oz of water in it. Not so good, so I had my cousin who is a Toyota tech order me a new one. All in all took about a hour to remove and install the new one. It's nice to have fully functioning 4wd, I havent had 4lo in about 8 months hahahah.
Here is what the old one looked like on the inside..... Not so good