2003 trailblazer 4x4 front end vibration

chevrolet
trailblazer

#1

I took of the front wheels and found a grumbling noise where the cv joint goes into the front diff. I spun the shaft with the hub disconnected. I was told that it is the cv bearing, but how do I tell if it is that or the diff bearing.


#2

This is the rest of the info for the question. It starts at about 10 mph and does not rise as mph rise and continues to I stop. Also the front left cv axle is harder to turn that the right side.