I recently purchased a 2006 trailblazer,119000mi, seems to be solid. I've started getting a rhythmic knocking sound, it's like a washing machine spin cycle sound... This occurs at fifty five at sixty it's loud, there's no noticeable vibration in the steering wheel or anything I'm very curious what could be the cause. Wheel bearing? CV? Tie rod? Any help would be appreciated.

 

Rotating the tires would eliminate that as a source, but no vibration is a fairly good indicator against it being tires.

Mikeeee