14. Thankfully, the 2007-and-newer truck frames have a ton of axle clearance designed into them. As such, the old style C-notches have become somewhat extinct when lowering this series of trucks. What did require attention was this bumpstop extension. When cutting this protrusion from the frame, we were sure to only cut through the weld and not the frame. The process went a bit slow as we checked multiple times to prevent an accident.