[roadtrp204]

The top seam in the bottom of the door opening is three pieces of metal spot welded together, the inner longitude, outer longitude, and the door threashold or step plate. When I put outer overlays on mine I had to also replace the step plates, they are spot welded at the top and brazed at the front and rear, plus the gussets at underneath spotted to the outer longitude.

I am also in the process of repairing the rear truck floor. The replacement piece is just the rear half. It goes from the rear tail light piece to just in front of the tranny mount hump. I plan on cutting the floor out along the rear edge of the tranny hump back and overlaying the section at the tranny hump so I don't compromise any of the strength of the tranny mount.

Get the metal as clean as possible, any rust, seam sealer, or grease really causes the welder grief and usually ends up blowing holes in the metal. Use plug welds to imitate the original spot welds, which requires you to clamp the parts tightly together. Vise grips and self-tapping metal screws work well for providing the clamping force. Try to keep the welder on time to a minimum, the heat build up warps the sheet metal fast.