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About a year ago, I had my 75 Corvette towed to the shop I go to, to get the steering fixed. I got into the car from the drivers door, drove it onto the flat bed, and away the driver went to the shop. Somehow on the way there, something got disconnected and I could not open the drivers door.
The door now will open from the inside door handle but will not open from the outside door handle.
Based on your description alone, the issue seems to be related to the "Outer Door Rod". If one of the two clips that attach the outer door handle to the door lock mechanism has come off, the rod will likely fall out of place and the outer door handle will not unlatch the door.
You will need to remove the door panel, but when you do, you should have the below views of the inside of the door and where all of the rods are and how they interface with the door lock mechanism. If the rod is still attached, it may just be a matter of adjusting the rod to increase the amount of movement.
I believe I downloaded these pictures a while back from the Forum, so I can't recall who may have posted them, but I felt they would be useful for others to use for troubleshooting.
Door handle fix?
