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How do I get the old pan out, I am replacing the front D/S with 1/2 pan and the Pass. side rear pan.
Specifically, how do you get the crimped welds along the door?
Don't specifically know 73's, but the 70' and back does not have the pan coming all the way up to the seam running across the bottom of the door jam. The pan's on 70 back spot weld on the horizontal plane right before that lip/seam (under the wiring covers).
That "crimped welds along the door" would be the spot welded section between your inner and outer rockers.
Your front pan also lips over in front and spot welds to your firewall. It also spot welds to a section of the front rails before the firewall, torsion bar crossmember, floor supports, to the rear foot pans, as well as a few more spot welds to the inner rocker towards the rear of the pan.
Your rear pan is pretty self explanatory. Look for the spot welds across the front and rear of the pan and on the side. Take a power wire brush, clean off the rust, dirt, seam sealer and look for the spot welds.
Like stated before, this is how the 66-70 B-Bodies are tied together and maybe even earlier. I'm not quite certain your 73' is the same, but I imagine it wouldn't be much different.
Best bet for removing those spot welds is using a spot weld cutters. I would highly recommend Blaire spot weld cutters...Proudly made in the good ol' U. S. of A. (Michigan)