Ok... I cant figure it out. Unfortunately I have to drive may baby back and forth to school (about 55miles) a few time a week till I find a 4cyl Ranger dd. So I have noticed when Im on the freeway doing 67-70mph I occasionally get some REALLY bad vibration, and no its not the road. I Know I need and alignment and Im gonna get my tires rebalanced pretty soon, but I cant figure out why it only happens sometimes. Any ideas?