vibrating

at 70mph it starts vibrating really bad i guess you could say shaking but at 65 it pretty much all goes aways, i would say a wheel bearing but i'm not sure if straight axles have wheel bearings

What kind of vibration? Steering wheel shaking crazily, or just a thump coming through the floorboards? A bit more detail would be helpful.

Yes they have wheel bearings. My Jeep has hub bearing assemblies and they are prone to failure. You can jack up the front end and start looking for play in the wheels or suspension. With the wheel off the ground grab the tire at 12 and 6 o'clock. If there is play then it could be a wheel bearing or ball joint. Next try at 9 and 3 o'clock. If there is play here then it could be the tie rod ends as well. When was the alignment checked? Tires balanced?