OEM Issues
Just solved my vibration problem...again.
2003 Trailblazer 4.2, 4WD. NOT extended version. Currently 247K miles.
Several years ago, I had a vibration and noise from 68--78 mph. No* shake at 65 or at 80 mph. Worst about 74 mph. Not dependent on power or trans gear--would do it on throttle...