Vibration in Drivetrain
 

I got a pretty bad vibration, It seems to be around 100 klicks I cleaned all the mud out of the tires and its stil there. My transfer case has been making a few strange noises once in a while, but seems to work fine. I noticed a little oil seeping from the transfer case and also from the rear end input shaft (Rear Diff) Could it be the clutch ? Comming apart or cracking.