For those of you who are not familiar with my jeep it is an 06 TJ. Lately I have been hearing a "Tick" coming from under my jeep while moving.  It only occurs while I am moving and only while I am while I am in either neutral or have the clutch pedal pushed in.  It will occur sometimes if I am gliding (it is in gear but my momentum is greater than that of the gear I am currently in. In other words, the transmission or not under load)  I am hoping it is just the clutch but I fear it my be the transfer case.  If I put it in 4WD it is less likely to occur.  Any ideas?