Front end shake

[BossHauler]

At about 35-45mph the front end shakes pretty violently. I drove next to it and had my friend get it up to speed and could see the wheels shaking then stop as he slowed down. The truck front end looks to be original and didnt see any lose movement when I laid under it and had my friend turn the wheels back and forth. It probably needs a whole new front end kit but just trying to keep cost down and fix the problem for now. Any direction on what it is will be appreciated. Was told it might be the spindles. Thx