Unknown noise

ChiXterra

Wheeling
Right when I start up the X, and begin to drive it, I get an annoying click/hum noise coming from the front side of the vehicle. It will shift, and the sound goes away temporarily, and then comes back. It's nothing on the wheels/ tires. What's weird to me, is that the sounds goes away after driving for a few minutes. I was thinking the catalytic convertor the first time I heard it, but I'm not so sure.
 
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