if you are gonna run it on the street i would not worry about what you have...its not going to hook good enough on the street the compromise the shaft...if you take it to the strip with slicks etc...you need to upgrade your shaft..i would say minimum of .083 wall 3 inch tube..
again as long as your not dead hooking,,you will have not much to worry about.. IMO.
if you have a chassis cert guy near you he can sonic check the wall thickness and tell you.
Brian
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Bjuice..
"I'M YOUR HUCKLEBERRY ! "