BROTHERS C notch kits are awesome! C notching is the only way to clear the lowered rear axle for these classic trucks. Our C notch kit is made of 1/4 thick steel and is more than enough support for your trucks frame while giving your truck aproximately 3 added suspension travel. Adding a C notch is always a good idea to retain original ride quality on any lowered truck. BROTHERS strongly recommends C notching any truck with a 4 drop or more. C notching will eliminate axle to frame contact. Kit includes frame plates, bump stocks and hardware.