GMC NOISES ROARING

There Is What Sounds Like A Bearing Going Bad When Driving And Especially Noticeable At Speeds Below Fifty Mph And Gets Louder When...

Upon Starting The Van. A Loud Roaring Sound Is Heard Under The Hood And This Noise Was Very Loud That Couldn't Be Ignored. What Could It Be?

I Have A2002gmc Sonoma With A 112,000miles, 4.3 Engine, 4x4 And When You Give It Gas It Has A Roaring Noise, But When You Let Off The Gas...