04 Dodge Ram 1500 AWD/4WD. Something is clicking in drive train especially when starting up a hill or if I gas it real good...I can feel something spinning and clicking. Front drive shaft has been repaired twice by a national company. I took it back to them for warranty repair to the front drive shaft yet again as it has same symptoms as both times before. They claim it's rear drive shaft this time, not the front. I got underneath while it was on their lift and hand twisted front and rear. Neither could I really feel or hear anything despite the mechanic saying he can feel it when he turns rear shaft. Both have about the same play in them. I'm thinking it's either the front drive shaft or possibly the transfer case despite the mechanics claim of rear drive shaft. Obviously the transfer case isn't the least expensive or easiest to do so hoping someone has other guidance?