I have the same issue. I called the salesman and was told that it was 90ft lbs, but the mechanics tighten them as tight as possible. I have tightened mine until they feel like they are about to strip, but no joy In looking at the GMC steps, the brackets look like they bolt to the frame instead of using the body mounts. I am going back after lunch to look at some that are mounted. If that is the case, anyone want to buy some aftermarket steps cheap?