Selling a hard to find 1999 to 2004 Dana 60 knuckle for the F450 or F550 super duty truck. This is the considerably larger style knuckle that came on the F450 and up Dana 60 axles. They use giant brakes that are much different from the brakes offered on the smaller trucks. They will bolt to a standard 1999 to 2004 Dana 60 and can be used with normal unit bearings. These are a great way to add the largest brakes available for those year trucks.