Just oil... no damage at all other than the bolts. just have to take it apart, get the remaining pieces out (shouldn't be hard at all considering they were loose enough to back all the way out on their own), and replace them. The hardest part will be getting the passenger side shaft out to remove the carrier. All 4 caps are welded all the way around b/c the ears were getting egg shaped and the caps didn't want to stay in.