Four types of rear axles are used on Ford F-150 and Bronco, F-250 and F-350 pickups:
- The Ford integral carrier type semi-floating 8.8 in. (223.5mm) ring gear axle used on F-150 and Bronco models.
- The Ford integral carrier type semi-floating 10.25 in. (260.35mm) ring gear axle used on F-250 Light Duty models.
- The Ford integral carrier type full-floating 10.25 in. (260.35mm) ring gear axle used on F-250 Heavy Duty models and F-350 models.
- The Dana 80 integral carrier full-floating 11.25 in. (285.75mm) ring gear rear axle used on F-Super Duty models.
On a full floating rear axle, the weight of the vehicle is supported by the axle housing. The axle shafts can be removed without disturbing the wheel bearings.
On a semi-floating axle, the outboard end of the axle shaft is supported by the bearing which is mounted in a recess in the end of the axle housing.
The axle shaft on a full-floating rear axle is held in place by a flange and bolts attaching it to the hub on the outboard side. The hub is held to the rear spindle by nuts which are also used to adjust the preload of the rear axle bearings.
The axle shaft on the semi-floating rear axle is held in position by C-locks in the differential housing.
Axle Identification and Ratio are found on an I.D. tag located under one of the bolts on the differential housing. Also refer to the Drive Axle Section of the Capacities Chart in Routine Maintenance for complete model application.