You need to clean the outside of the t-case. Those leaks that you are seeing could be old and it no longer leaks, it could be motor oil, P/S fluid, trans fluid, anything. Anything that leaks from the front will run down everything that is behind it and can make it look like something else is leaking even though it is not.
You need to start by cleaning the underside of your trk.

 

Believe me, it is spotless under the truck. You should see my Simple Green budget. I tried to upload some photos but couldn't get them to upload. Thanks Phil

 

Ok, you didnt state that you cleaned it.
You could try any one of those stop leaks, what do you have to lose right? Personally I wouldnt.

 

i agree with spike here, dont use them, theres a good chance youll end up 'sealing' the leak on your pick up for the fliud pump... bad idea, in case the sarcasm didnt show up enough

 

LR t-case's do not have a pump, they use something better and much more reliable, splash lubrication.
The gears are partially submurged in gear lube and as you move they spin and the teeth pick up the gear oil and sling it around. Works every time. No matter what the angle your trk is at.
But yes, you could clog your breather tube.