Note:?This lift kit is packaged with rear blocks and u-bolts that are configured for the Ford F-250/F-350 pickups with the factory 1 7/8" blocks without top mount overloads. If your vehicle is equipped with the factory 3.71" block or top mounted overloads, a longer rear u-bolt will be required and is available from us. Please refer to the options list or call our technical support line for additional details.