Dragul my gut tells me you may be correct since there is buildup on one side but not the other. The only thing thats throwing me off is the fact that I can hear it big time inside the car and cannot duplicate it with the stethescope. One thing I did notice is the driveshaft moves as I twist it with the car turned off and brakes on. Is this normal for the shaft to move? It moves about 1/4 of an inch to the left and to the right.

 

Nevermind the shaft, I put my jeep in neutral and shaft has play also so this should be normal. My jeep is brand new