Wheel Hubs and Bearings

The F-Super Duty full-floating axle features disc brakes. The rear disc brake rotor is mounted to the rear hub (1109). The rear hub is supported or floats on the axle spindle on two opposing tapered roller bearings. The rear hub is retained on the spindle by a ratcheting nut tabbed to a slot on the spindle.

A seal is installed behind the rear wheel bearing inner cone and roller (1244) to prevent rear axle lubricant from leaking.

The rear wheel bearings are packed with a lithium base grease, Premium Long-Life Grease XG-1-C or -K or equivalent meeting Ford specification ESA-M1C75-B, to provide initial lubrication until axle lubricant flows into the rear hubs and rear wheel bearing inner cone and rollers during vehicle operation. These rear axles (4001) are vented through the rear axle housing vent (4022) in the left axle tube.

Dual rear wheels are attached to the rear hub with integral two-piece swiveling lug nuts.

 WARNING: ON REAR AXLES WITH DUAL REAR WHEELS, DO NOT USE PRE-1985 CONE-SHAPED, ONE-PIECE LUG NUTS TO REPLACE THE INTEGRAL TWO-PIECE SWIVELING LUG NUTS (1012). OLDER VEHICLE LUG NUTS CAN COME LOOSE IN VEHICLE OPERATION. DO NOT USE OLDER VEHICLE WHEELS, WHICH HAVE CONE-SHAPED LUG NUT SEATS, ON THIS VEHICLE. DO NOT USE THE NEW DESIGN WHEELS AND LUG NUTS ON OLDER VEHICLE WHEEL HUBS. USE OF INTERMIXED WHEELS CAN LEAD TO DAMAGE TO THE WHEEL MOUNTING SYSTEM AND COULD RESULT IN WHEELS (1007) COMING LOOSE IN OPERATION.