Doing a C-notch in the frame of your 1988-1998 OBS C1500 or K1500 truck can be a pain and requires some math. Stone Custom Fab did all the work for you and offers a full back half kit that comes with a custom C-Notch, along with full wishbone suspension to keep your axle centered. Running the Stone Fab C-Notch kit will give you optimal clearance of the axle to the frame of the truck when lowering it, whether you’re bagged or static. The wishbone suspension will also improve handling and keep the truck straight when adding any amount of power.