Dliptak, I have c chanels bent to wrap outside of the frame without the extra flanges you show on your photo. What you picture looks like a cee purlin. The web refers to the vertical part of the frame. The flanges which are the horizontal pieces on top and bottom of the web. They are the ones that actually are the strength. If you are going to actually work the truck, be sure to put a crossmember at the splice. If you are just going to use the truck for parades, etc. you can get away with just cutting, making a v to weld in and weld a diamond shape patch inside the frame. But this is not recommended for a truck that is going to work hard. Although moving the suspension up is common practice on today's straight frame class 8 trucks, it is usually not possible on 2 tons with tapered frames.
