2014 - Ram 1500
 

Just curious if anyone has experienced this or know what it may be. I bought my 2014 in May of 2016 and only recently I have noticed a whining from the rear end. It's not the tires or brakes, sounds like gears and most prevalent under 35 mph while I am braking. Sounds independent from the transmission. I'd like to think it is all in my head but now because it is there, I hear it all the time as well as my passengers. Just looking for any direction. Appreciate any input.

Tom