Originally Posted by grouch
If the purpose of boxing a frame is to make it more rigid, torsionally or otherwise, why not weld the extra piece in from one inside corner to the diagonally opposite outside edge of the typical C channel frame? Wouldn't that provide more rigidity for the same amount of steel added?
It would make for more work in curved sections of a frame, but it looks to me like it would result in a very rigid structure.
i had an s10 that i welded the frame diagonally behind where the boxed part of the frame ends. if you look at my photos you will see where i totaled it and because i had done that i saved my motor and trans and trans crossmember including surviving with minor injuries. i think that if i had just boxed the frame it would have caved in more on impact. every s10 i build now gets that upgrade.