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On the mountain yesterday the 4wd would not engage, the engine revved but would not engage. Shortly thereafter I saw some smoke and got out to see what I originally thought was transmission fluid (from transmission) gushing on to the ground. I gave it some time to cool off, put it in 2wd mode and was able to drive home with no problems. I've scoured the net and joined this site and spent a couple hours under the area in question, completed the on board diagnostic for the 4wd system(1 blink every 2 seconds= no problems for the items the system tests for)and have come to this conclusion: take the transfer case out and replace the rear case to center case liquid gasket as that has possibly blown and while I'm in there check on or just replace the main oil pump. Due to the "blood splatter pattern" of the wet area underneath it seems to be centralized on top of the rear case. Originally I thought the air breather was the culprit (before learning what it was) because that hose was probably the wettest part around and the underside of the body right above that had fluid drops on some protruding bolts. Speaking of which should that hose have a clamp or zip tie? The tube is barbed. Trying to find some answers to this problem has really helped me better understand my vehicle. I now have a laundry list of items to check and oils to replace, not to mention checking on those engine screws. Is there a better course of action to diagnose the overall health of the transfer case that someone can recommend? Perhaps I'm overlooking something? Could the engine revving and not engaging mean a clutch is bad or tranny issues? Thanks for any and all insight.