The ReadyLift 66-2014 4" Rear Block Kit will add about 2 inches of lift to the rear of your 2011-2016 Ford Super Duty F-250/F-350 SRW Pickup. This will add a slight rake back into your front leveled truck for hauling or towing. The ReadyLift Block is based on OEM designs and made from heavy-duty cast iron just like the factory blocks. This ensures maximum strength and long-term reliability. Lift height will vary based off of what size block your truck was equipped with from the factory. FEATURES: Provides 2" Lift Durable Cast-Iron Construction Works Great W/ ReadyLift 2.5" Leveling Kit Note: Fits Single Rear Wheel (SRW) trucks only. Fits trucks with or without the factory camper package. Works on 2-piece drive shaft only.