Fairly common I would say. I've owned a lot of these cars and only had a few with the crack.

 

My passenger's door on my 71 GTX needed a weld there. The doors are heavy.

 

My 73 had it bad on both sides but my 72 didn't.

 

My 73 has them on both doors

 

Interesting.

I have my 73- no cracks

72 Charger- no cracks

71 parts car- no cracks

Doors from a 74 Charger- no cracks

One door from another 74 Charger- no cracks

Maybe I'm not looking in the right place?

Where are they in relation to the hinge?

 

My 69 coronet door had cracks around the bolt holes where the striker mechanism goes on.

 

My split was on the short curve just before the fender.

 

Anyone have pics of this phenomenon?

 

I'll see if I have a cracked door.

 

Got to agree with yy1 never had any with cracks!
Maybe if there from a place that gets cold and hot alot? Not sure how Mexico is on temp in fl everything is hot

 

Possibly stress fracture from hinge roller and over-center rod sticking. The roller and over-center rod on my driver's door hinge would not budge when trying to shut the door. Liberal application of lithium grease to what I could get to on the internal surface, and a finger tip of axle grease to the rod end surface and it finally let up.

 

I was one of the replys you quoted, and here's one of mine (original paint car)

 

I can honestly say I have never seen that before in over 35 years.

 

I've had more doors without the crack but have had a few with it.

 

I think it's an issue of how the sheetmetal is stretched in that area because of the curve and the fact that it probably flexes when the door is opened. My B7 car (pictured) has it on the passenger side and my butterscotch car has it on the drivers door.

 

another

 

Both my door cracked in the same spot. Had to weld them during the bodywork stage of restoration.

 

Oddly enough, I have a 1972 Cutlass sitting in my barn with a door crack in the same place. Must be stresses from the hinge area directed in that spot.