It will fit 1/2 ton only

One piece of the notch slips over the frame and welds on, with the upper shock mounts pre-welded to the crossmember. Once installed, cut the frame and box with the filler pieces provided, and the truck is notched. Bolt the two link bars to the factory hangers, and then to the rear end with the u-bolt kit supplied. The lower bag mounts and shock mounts have already been installed on the bars, with a 2" block. To finish, the upper bag mounts are placed on a crossbar supplied, then welded. Lastly, the pan hard bar bolts to the notch frame mount and welds to the axle mount, and the suspension is air-bag-ready.