Help diagnose humming/howling sound
I've owned my 06 Dodge Ram 1500 4x4 Big Horn Edition 5.7L Hemi since 2008. Trucks been great, just turned 50k miles. Within the past 2 weeks when im driving around for at least 15min, get everything hot i'm getting a humming/howling sound ONLY between 10-20mph. Its very difficult to tell where its coming from front or back of the truck, the sound kind of echos around from underneath. When i start driving to work in the morning (cold starts) i hear nothing, it only starts doing it after driving awhile (15-20min) and it is inconsistant. I stop at one light, accelerate it does it, after passing 20mph it goes away, the next light it may or may not do it again. I took my brother who used to be a mechanic and my dad for a ride, everybody has been clueless. I thought maybe it was one of my brake pads hanging up on a rotor, checked them and they look perfect. U-joints looks a little rusty but everybody says they'd be making pretty bad grinding noises as well as wheel bearings. Wondering if anybody else has had this or has any ideas? It is under warrenty but i'm hesitant to take it in for fear that they will just say can not duplicate noise and charge me for the time they spent driving my truck around. Any suggestions before i have to just suck it up and take it in?