as for the rotors...idk how your driving style is, but big truck+little rotors+high speeds and/or hard braking = warped rotors. Shouldnt be warping every 2 months though. I believe the abs on 98 is only in the rear, and not on both fronts. I had the abs problem when I picked up my truck. I changed out the sensor in the rear only for it to come on again a couple months later.Strange story on how it finally fixed itself...one night I was commin home in the rain and some jerk cut me off and I slammed on the brakes and locked up, slid for a while and when I let off the brake bamn, the light was gone...never to return. I have a buddy that had the same problem in his ram told him to do that and it worked to fix his too. Idk what the hell causes that to fix it, but its worth a try imo.