[Fatherof3]

[QUOTE=Fatherof3;6483858]It only makes sense to do it this way if are doing a LWB to SWB conversion and want to go lower than mild notch allows. I have a bolt in notch that is designed to fit under the floor that is probably 3.5" deep. This way that 3.5" of extra clearance just became 6.5" of extra clearance over the axle with out cutting the frame into three pieces the way I would need to if I was shorting the frame and doing a notch all the way through the frame. And now all my rear suspension mounting points are moved up 3". Effectively I'm just Z'ing a short bed frame but the frame over laps because I started with a long bed and will be a stronger splice this way too.
Having the lower 2" of inner bed sides rusted through and wanting to go lower that the stock floor would allow is what's behind doing it this way.[/QUOTE
It's not to lower it just 3", it is to have 3" head start to going much lower while shorting it.