UMI’s reverse leveling kit is the ideal product to lower the rear of your F-150. Lowering shackles are popular for adding additional rear lowering adjustment or leveling a factory height truck. The F-150 rear height comes very high from the factory, adding the reverse leveling kit results in a more sporty look. These help your truck look clean and sleek and less like a jacked up work truck. Kit is a direct bolt in with no modifications required. 100% Made In USA. Fitment Note: UMI’s rear lowering shackles lower the rear of the truck up to 1-1/2″. 4WD models can lower an additional 1-1/4″ by removing the factory installed leaf spring block. (8) U-Bolt spacers are included to allow block removal without needing shorter u-bolts.