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Jbulach is correct, you should make sure of what the frame material is. I should have been specific that the welding I was referring to was for 110,000 psi. Ford's bulletin Q-140 specifies preheat of 500-600 degrees for frame materials 50,000 to 120,000 psi steel.

In the drilling business we modified many trucks to mount different kinds of equipment on them. The modifications usually involved attaching various components and/or lengthening the frame. I don’t have much time today, but I wanted to do a quick response since welding on the frame often...