[Tom Goldman]

Unless you are going to go from mild steel to chromemoly tubing the weight savings will be extremly small. ............When you go to CM tubing the wall thickness can be slightly smaller on the box tube, depending on the chassis spec you are building to. ........058" box vs. .083" for tube.......I'm assuming you are more concernad with the tail section of the chassis,and not the frame connector area. ......Every builder has a preference ,altho some cars lend themselves more to one or the other. .....If I can find it I'll post a link to a site that has charts with all the weights per foot of various size tubing. .......TOM