Had to put calipers, pads and front hoses on the 92 Cummins yesterday. Was going to change the rotors also....But..... they are pressed to the hub, with the studs...Total PIA to change. They looked plenty thick, also. So I broke out my dial test indicator and checked the runout. Same on both sides. Only .005. The right side was stuck, so not warped terribly. I'll return the rotors........