Gearbox and/or Transfer Case Leak

I've been attempting to track down a leak that has been dripping off the base of the LT230 transfer case, I'm having a very hard time pinpointing the source of the leak. I put regular gear oil in the transfer case (green) and redline MTL in the LT77 gearbox (red), and while the oil that is dripping appears green the transfer case is actually still full and it's the gearbox that is steadily losing oil. At the risk of sounding really stupid (eh, I'll just accept it), could the gearbox be cross leaking into the transfer case keeping it full, while the transfer case is leaking out? I'm just confused why it seems like I'm leaking green oil but the gearbox is what is low.

Assuming it is just the gearbox leaking and I'm being color blind, what would be the most common culprits for sources of leaks? I'd like to get this tracked down as it is one of my last more significant leaks in my quest for the elusive relatively leak free defender. I've done some research myself on LT77 leaks but figured I'd get the consensus from the forum before I tear into this. I appreciate the help!