How can I move in with my grandparents when I am 17 and my dad disapproves?

Im with ^^ on this one. if the living arangement is not a healthy one for either parties it's time to consider other options. He's your father, and obviosly if you care what he thinks that means you know somewhere in his sould he loves you and I don't think anything you do would change that. At the end of the day you should be happy and if the arrangement is to stressful it's time to walk away.