If you choose an assembled ProRock forty four that has a new differential or locker, the cost consists of the ring-and-pinion gearset, equipment setup and put in package, yoke plus the axle will come to you assembled. You need to insert the knuckles and brakes from the manufacturing facility axle. https://softtopfor2005jeepwrangle37036.wikiannouncement.com/7525084/detailed_notes_on_dana_m186_front_axle