I think that your t-case is the adaptor seals, your diff leak is pinion seal, and I would actually guess that the small leak isn't anything but seepage. That is very common on all Jeeps. I have seen all kinds of TSBs on that. I was taught that is the area where you think it's leaking is clean w/ dirt and sludge around it you have a leak, but if you just have dirt and sludge then it's just a little seepage and nothing to worry about.
Parakeet
P.S. The Quicky Lube places will try and tell you that it's leaking when it's just seepage to make a quick buck.
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Oh MAN I got NATURE on my Jeep.
05 KJ Renny that took the bad economy bullet
89 XJ that thinks tax time is Christmas
I will have another KJ I promise.