Quote:
Originally Posted by Dieselwrencher
I used to work in a heavy truck frame shop. Without heating the frame rails you will more than likely never straighten the frame without damage to the metal and or the equipment. So yes you can heat them. I used to get the semi frames glowing red with about 25,000psi of force on them and would leave them until cool. On a heat treated frame, you do not want to quench them like mentioned. On these older frames it won't hurt them but I would just let it cool once put in a pull or bind used to help straighten them.
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My experience also, do not quench, just let cool with straightening apparatus in place. Remove and measure. Most frame shops will work within a plus or minus 1/4" on 2wd stuff because you can make it up in alignment. On a straight axle I'd go for right on, but if your as close as an 1/8" or 1/16", I'd try and drive it and see what happens. You have done very well redoing the truck since the accident, you have nothing to lose by straightening the frame some more. Just be sure your wires, brake and gas lines are away from the inside of the frame rail before you apply the heat!