Here's some pics I took when I changed the ATF fluid and filter in the 4x2 Titan I used to own. They apply to the 4x4's as well. I did this fluid change at 20K miles and it still looked brand new......I'm not totally sure what the Nissan Matic-J ATF is made of but it must be good because I ran the heck out of that truck, just like I do the 4x4 I have now...As always better/larger pics are available at my pixagogo link. Also you'll need 4 qts. of the Nissan Matic-J fluid to do this change, and that stuff is pricey....about $12 to $13/qt. and the filter was $15.