Just bought an 06 Silverado that was GM certified, but there are a few weird noises?

D-END44

New member
When I turn my wheel about 2 or 3 rotations. there is a really fast vibration. It almost sounds like a grinding but I listened closely one day and it is a series of super fast vibrations. Also, when I accelerate very slowly there are vibrations as well. My belts squeal too when my truck is warming up, but after it is warmed up a bit they stop squeaking. Are either one of these noises something that should be of concern?

And the truck is GM certified, so doesn't that mean that everything is okay? And if not can't I take it to a Chevy dealer to get it fixed? I know I asked a lot of questions, but it is my first truck and I want to make sure I take care of her the right way. Thanks.
The vibrations seem to come from the front of the truck
 
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