Instead of a complete single-unit subframe, Fabtech uses a multipiece lower subframe to support the front differential and drop the lower A-arms. The multipiece subframe allows the easy removal of the center differential if service is needed. We don't know of any quality locking differentials for the front axle, but our experiences with the aluminum front diff housings would suggest ease of repair as we've broken a few. We also like the ground clearance of the Fabtech front subframe. It should help when wheeling rocky trails, yet there is also a small skidplate for under the ring-and-pinion.