Revolution Gear D60S-Flange-Kit is a 35 spline Drive Flange Kit for the 2005 and newer Ford Super Duty Dana Super 60 Front Axle.The driveline sustains a lot of force when off-roading, and the stock hubs on vehicles are often a weak spot. Many off-roaders replace the OE hubs with stronger drive flanges (aka drive slugs). Our Dana 60 drive flange kits reduce the chances of failure.