Hi all. Ive been having an issue with my 93 suburban. Keep in mind it did this before it was dropped (spindles, springs, flipkit) Around 70 mph the truck has a vibration. Ive ruled out the following: new tires all balanced (twice actually) new front wheel bearings and rotors. New rear drums. Checked pinion angle (about 1.5 degree pinion nose down from the trans). Its been aligned since the drop. I can put it in neutral and it still does it. Ive also rotated the tires with no noticeable difference in vibration. Also ive jacked up the rear by the axle and spun it up to 70 and the vibration seems to persist. U joints seem fine. It shakes the steering wheel (can really feel it if you have both hands in it) but you can also see the pass seat wiggle. This is really frustrating especially on long hauls. Any help is greatly appreciated from a newbie.