Other than overkill, are there any other reasons you wouldn't go to the thicker metal? A heavier frame will allow you to upgrade in the future if you need to. It will also be stiffer, which will aid the suspension. Weight increase shouldn't be that horrible.
The weight increase is 1.2lb/ft and I'll guess at 10-12 feet of tube needed, if I understand what you want to do. I think the .083 is enough, but the added weight isn't much if you wanted to go thicker.
In reply to Mr_Asa :
Just trying to find out what works best. I have some 1/8 thick tubing here at home already and it seems like its way to thick to be putting in place of the original rail. I'm gonna be splicing it into the front section of the frame rail that's not rusted so I didn't want ot go too thick. I already have a Detroit speed mini tub kit and their included frame rail section to move everything inward is .083 thick but it wont cover the rusted portion of my frame rail which is why I'm gonna mimic it and just extend it all the way back.
Use what the chassis guys sell in their back half kits.
Art Morrison, Chris Alston, s&w race cars, etc....
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