Thanks dnp,
I had the same problem on my Lexus GX 470 2003 with 84,000 miles on it.
I started noticing a oil drip on the floor of my garage.
I took the vehicle in to a shop for a look over. The shop said,
it will cost $ 2,000 because the transfer case has to be removed and taken apart. That takes 20 hours of labor. I said, Forget it I'll sell the vehicle.
I found your comments through a search online. I printed what you said took pictures under the car. Appeared to be the same type of leak. I then took the vehicle this morning to another repair shop and had them read your article and compare your pictures with mine.
They took the vehicle raised it up, took out 3 bolts, slide the acuator off. Then looked at the seal, it was a bad o'ring. They ordered a new o'ring from a Toyota Dealer because Lexus always has to order.
Installed the new o'ring and put it back together in 1 hour.
Whalla problem solved for $ 85.85.
A far cry better than $ 2,000.
Thank you for your information