So the best way to describe this sound is a "whomp, whomp, whomp" that starts slow at about 40 MPH, then gets fast and silences around 50-55 MPH. Then it comes back at 70 MPH. When I let off the gas the sound seems to go away. Drive shaft?? It is not the loudest noise, but on smooth roads you can really hear it. I have taken it to the dealer, they inspected the diffs, drive shaft, greased u-joints and told me all was fine. Tires have been balanced twice (Nitto Terra Grappler 285/65/18). No steering wheel vibrations, and the truck drives straight. More info, I am lifted full OME 885s, dakar springs on the rear, LR UCAs
This has really frustrated me, any input is appreciated.