Hey y’all, my 2017 3500 SRW has started the have a slight grind noise coming from my rear end. (I can only hear it with my back glass open) The noise is consistent at low gears whenever I exceed 2k RPM. I’m not sure it is a bad pinion or wheel bearing because I am not getting any vibration in my acceleration. The grind stops once’s it shifts to lower RPMs.(it’s just a grind, no clunking) I also changed my transmission spin on filter and topped off with factory fluid. About a month ago. Have y’all had this happen before? If so how were you able to fix it? Truck has 87k on it.