My mount was all gone but did come with a nice critter home.
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I was very surprised to find out that once I jacked the cab up, my door went back to closing straight without the drop I thought I was going to have to try and adjust out with the hinge bolts, or replace the hinges.
My son helped with the project and we cut the flanges off the old mount. I didn't know how it was going to fit up so I only took a section off at a time as I wanted to leave as much of the old, good metal, in place as possible.
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I also took some of the floor out. The truck sat in the field at my wifes grandad's place for two years with the wing vent open and I think that's what caused the rot.
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I trimmed a section off the right side of the mount starting about 2" wide at the back, down to nothing at the top lip.
A dry fit proved to be very nice so I can't complain about the design of it.
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I'm going to finish the job today and take more pictures.