2003 GMC Sierra / Chevrolet Silverado 4X4 Pickups Front End Vibration

2003 GMC Sierra / Chevrolet Silverado 4X4 Pickups Front End Vibration: "COMMON COMPLAINTS
4WD Light on?
4 x 4 not working?
Engine Knock
Front End Vibration
Rotational noise in the front end when they are in 2X4
No fix available "