I have a 2014 Dodge Ram 2500 standard cab long box 4x4. It makes a gear howl noise in 2wd only. When it is in 4wd the noise goes away. It doesn't matter if I am accelerating or decelerating or turning or going straight down the road. The dealer already changed the transfer case but it didn't make any difference. They have no idea what to do next. Anyone else having this problem?