offrdmania

New 2018 1500 crew cab owner here. Im getting a center console shake from 68-74mph and if im cruising on the freeway at 75-85 and barely tap the accelerator to go up a hill or pass someone, I get a drone/hum in the rear end that resonates through the whole cab until I take my foot off the gas. The truck has the factory 2-piece drive line. Now I did do a shackle drop in the rear but that shouldnt change the drive line angle enough to cause the angle to be too far off I dont think. Could this be the rear axles being out of round like ive read on some previous posts?