The differential brackets are bolt on secured under the differential. This is done by removing the inner factory u-bolts and, replacing them with the supplied bolts. Which will clamp the leaf pack to the differential bracket securing it from movement. Then there's an additional u- bolt that secures around the axle tube to the diferential bracket which is also supplied in the kit. This would complete the hardware installation to mount the braket to the rear differential housing. Hope this is able to paint a picture of how the bracket is mounted and installed.