I bought a 2003 LC about 18 months ago from a dealer in Ft Worth Tx. I gave it a once over looking for leaks under the vehicle and it was dry etc. it drove well back from Ft Worth to Houston but seemed like allot of heat coming from the front end. Anyway I dont drive it much and decided to have some maintenance done. Changing the diff and transfer case fluids. I decided to do it myself since the dealer wanter about $200 per gearbox to do it. Everything looked good, the rear diff fluid looked relatively new the transfer case darker. When I got to the front diff the top plug was a torx and was very tight. I got it off and it looked like someone tried to jam a hex in there. When I removed the drain , the plug had this gelatenous black sludge attached. Nothing was draining out so I stuck my finger in and more sludge came out and finally a little fluid but not much. I filled it with M1 75/90 and the leaks began. I am monitoring it but it seems to be losing an ounce a day. It doesn't seem to be leaking from the plugs but strangley above the fill plug. I believe the reason I saw no leaks when I bought it was because it had very little fluid in it. Any advice appreciated, after reading some posts on the subject seems like a seal. Any Idea on the cost of replacement? I thought about putting in a thicker oil 80w140 but it leaks just parked.