Replace the rad and be happy you haven't had any/all the problems posted around here. As for the PRG suspension. Im not trying to start a fight, but you just must not be as in tune with your truck as others. While I have never owned a lifted 4x4 before this truck, I know that lifts generally make for a stiffer/rougher ride. That being said. I can't say enough about how good my truck rides now with my PRG basic C/O lift. Even after cranking the coilovers up I still feel it was a good improvement over stock. Not night and day different, but definetly better.
My .02
My .02