The plot thickens!So, I worked at cleaning off the flat spot by the dipstick, and I'm not finding much. I think I might see a hint of a "72" in there somewhere, but it could be my imagination. If there were numbers on this block in that location, they weren't very deep.
Engine Serial Oh well, at least any DMV agent will have a hard time proving that this
isn't the right engine. Silver linings I suppose.
Now for the door post tag: I scraped, sprayed with brake cleaner, scraped some more, and it revealed something quite laughable.
Door Post Tag So, here's my theory: my truck is entirely pieced together. If that tag were the right one, this thing wouldn't support it's own weight. From all the helpful charts you all have provided, I'm assuming the GVW should be 16000 lb, not 5000.
All this leads me to conclude that the cab was probably swapped from a 1/2 ton. Since the A-piller tag actually matches what a 6400 should have and is held on by screws (which shouldn't have been used after 1950 according to the links you all shared), I'd say someone had the presence of mind to keep the original tag when they swapped the cab. Unfortunately, they didn't bother to do the door post tag at the same time.
