I just replaced the transfer case and differential fluids in my Outlook. I splurged and used Amsoil Severe Gear, I'm not an Amsoil guy, as I like to change my oil often and anything rated to go 25,000 miles would just be a waste. But I figured, "Why not", since it may be another 5 years before the fluid is changed again.
The rear differential is easy as pie. It only took a few minutes to drain and refill. The front transfer case is a different story. The fill plug is tucked up above the exhaust, and my 10mm Hex socket just wasn't long enough. I was able to custom make a part out of an alan wrench and a ratcheting closed-end wrench, but it was a pain.
The rear fluid was dark black/gray with lots of gunk on the magnet, which sounds pretty typical for this vehicle. The front transfer was dark, but not like the rear.
However, in the end it was all worth it. I was able to replace all of the fluids for less than 30.00, and an hour of my time. I think the dealer price is 250.00 or something outrageous. Next time, it will definitely take me less time, now that I have fashioned my own custom part.