RCV Ultimate IWE Eliminator Set for Ford Raptor ('10 & Up), F-150 ('04 & Up), Ford Expedition ('03 & Up) & Lincoln Navigator ('03 & Up)Completely eliminate the OEM IWE and replace it with this ultimate 4340 sleeve. Simply remove the stock IWE and install these sleave in their original place. Once installed,your hubs become fully locked to the axle shafts allowing you to usethe transfercase to shift in and out of four wheel drive. Confident in their design and strength, these gears come with a RCV Performance's limited lifetime warranty against breakage! Must remove the entire factory