Zone Offroad Products F5401 carrier bearing drop kits can help you to eliminate driveshaft vibrations in your lifted Ford F250 / F350 truck by shimming down the carrier bearing so that the rear drive shaft angle is as close to the factory drive angle as possible, These steel carrier bearing drop kits are powder coated for durability and include mounting hardware for a complete install. If your truck equipped with a 2-piece rear drive shaft and you're installing a lift of 4 inches, then this a driveshaft alignment kit may be required.