Hello XXXXXX, thanks for the accept and sorry that the brake rotors didn't fix it. I was sure they would since most of the time vibrations in the front are caused by the rotors. In any case I would like to continue to try and help you. I'll trust that the parts you replaced are good so here are a few suggestions to try:
If you know how to check these parts then have at it if you need me to tell you how just respond again:
-check the front wheel bearings
-check the front driveshaft U-joints
-with someone wiggling the steering wheel left and right on the ground check all the front end tie rods and that idler arm bracket for a lot of play/looseness in the bushings.
Also if you respond again please include details of the wheels shaking? Is it when you apply the brakes? When you are coasting to a stop? Perhaps the vehicle needs an alignment. If your going to replace any front end steering components, wait till you replace the part before getting an alignment. Do you feel the shaking in the steering wheel or in your seat mostly?
XXXXXX,
Continue to check those other things I mentioned and also check the rear driveshaft U-joint.
Chevy Mechanic
3 yrs experience, GM Trained,