Swapped transfer case fluid, it was slightly overdue. I tried to do it about 1.5 years ago at 50K, but didn't have a socket that fit the drain plug due to my Invidia exhaust - the flex section is right there. So I picked up a 1/2" socket the following week and waited another 1.5 years to do the job which actually took 15 minutes. At 64K, the fluid looked fine, just darker red than new ATF, no weird smells. The magnet on the drain plug had a little sludge on it, but nothing like what I saw on my front and rear diffs at 50K.
And a few days ago, I did swap on the TBW aluminum belly pan. Yesterday, I bottomed out and realized that it's much louder than OEM plastic when you scrape something. But no damage, it looks like I just hit the bolts.