ReadyLift (69-2524) 2.5" Lift Kit Max Lift: 2.5"F/2.0"R - Maximum Tire Dia: 35" - Stage 3 Dually Rear Wheel Spring Pack Only Note: F450/F550 may require the purchase of longer U-Bolts to complete rear installation. ReadyLIFT Smart Suspension Technology is used to make this kit very user friendly to install, requiring no cutting or drilling. Professional installation time is estimated at 2-3 hours. Like all other ReadyLIFT kits, the 69-2511 2.5 Stage 3 SST Lift Kit is guaranteed for life against manufacturing defects.