[stanger66]

I would take it in and have someone shake down the suspension. It sounds like maybe ball joints, wheel bearings, tie rods (1 of them) are bad. That can cause vibration at high speeds. If that checks out have someone check the driveshaft that also could be the problem. You might want to recheck the alignment. I would probably have someone check rotors/drums to see if they are warped/or bent. That could cause vibration at high speeds. I see this problem with cars just about everyday. I work at Merchants/NTB/BigOTires/Tire Kingdom as a Store Manager and customers always think its the tires/or rims. Not there suspension.