Highway rumble

[07stxscab]

Tried the search,maybe used the wrong words. Took my new to me '04(50K) out on the highway for the 1st time last nite. 67-72 mph there is a rumble & a low frequency vibration.Not a wheel shaker,just enough to notice something isn't right. Initially I thought it was coming from the RF,but realized it is throughout the entire vehicle.The rumble is loud enough that you can't hear talk radio on the stock radio below 1/2 volume. Definitely not a tire balance type shake. Any ideas?

 

[Limited02]

Does the sound change with speed? It's possible a wheel bearing is going out.

 

[rocco123]

I agree ...Wheel bearing

 

[Joe Dirt]

x3

 

[07stxscab]

Thanks guys. That's what I was thinking,but wanted some assurance before I take it back Monday am.