First Drive after building, Major shake

One more thought. Since it only seems to happen at the higher speed, could it possibly be what is called, death wobble. This is what happens when upper and lower ball joints are worn out. Had it happen on my 98 ram truck. At lower speeds under 50 or so it would be ok, above that it would about shake your teeth out. No signs of anything wrong that I remember. Just got in it one evening after work and it started shaking.