I got a little sidetracked after taking out the oil cooler for cleaning when I noticed what looked like a little corrosion behind the drivers side rocker. Upon removal I found that the entire bottom of the steel panel that is welded to the frame behind the rocker was all rusted. It was welded and seem sealed in place but came out relatively easy with a cutoff wheel. Once I got it off it was no surprise why it was so rusted. There was no primer on the back side of the panel or the frame behind it. Luckily, it was just very lite surface rust on the frame. The passenger side looks to be in the same condition so I will also be restoring that as well as the truck pan and also removing all the under panels and refinishing the entire underside of the frame and any other areas with corrosion.