Cast - aluminum axles and axle housing provide weight savings and help to reduce parasitic friction (media.fcanorthamerica.com)
All internally lubricated parts: Front or rear drive axle housing and all internal parts, pinion bearings, wheel bearings, side carrier bearings, ring and pinion, gears, spider gears and case, thrust washers and spacers, housing only when damaged by an internally lubricated part covered by the contract. (aamotors1.com)
The full - floating axle shafts «float» within the outer axle housing where they drive the wheels. (ford.com)