Check "torque boxes" under the donor tub before u buy it if u Havnt already done so. They are where the body mounts screw into. And also take a body mount bolt and put it in to make sure they will all screw in and not just spin. In middle of a tub swap myself. Wished I had known that little piece of advice. U van buy replacement torque boxes but they're not cheap and have to have someone weld them in. Furthermore out of all the body shops around me they all said they weren't comfortable doin it....ugh.