Need help on my Silverado.. Grinding.. Whirring sound up front in 4WD

Originally Posted by Bryson

Cv joint is when you make turns. Turn right and if your hear the click it means the left one is bad. And vise versa.

Just goin thru my notes from school last month, you are correct that they will make noise on turns, but they can also make noise and vibrate going in a straight line. Noisy Usually on acceleration. Although it would be louder and more noticable when turning.

Also check the pinion bearing. Look for leaks at the pinion seal. We just replaced a front diff from a 2003 chev, make sure the 4x4 actuator is fully engaging. This one we replaced wasnt and the fluid was full of chunks of alum. (If its electronic 4wd)