* Removal of the factory rear block is required. Net rear height gain will vary based on size of the factory block, but will result in a level stance.* Vehicles with a 2-piece rear driveshaft may require carrier bearing drop kit ZONF5401. * Although extremely rare, front drive line vibration may occur.* Rear box kit not designed for dually models.* Front exhaust modification may be required to clear the front driveshaft on gas models.