drive line vibration

Just installed my 3" rough country kit w/30" MTR's. My worry is the slight vibration coming from the driveline. At accel. there is none. The coast, none. But when I'm going down hills (on highway) and have the gas slightly depressed, it vibrates loud. Othere than that, really slight vibrations.
I'm not too familiar with the effects it can have. Will this slight vibration harm by drivetrain?

When I had that kit, I installed a 3* shim and it stopped all my vibrations. good luck

Re: aarning xo weld

I think mine was $150. It sounds as though he wants to cr`ate the exbuse deeded 4g jtstifp, to h(eself, 4m NOT take the class. IMHO.