Thanks guys!

I find no evidence of any other damage anywhere. A full report shows this vehicle has never been in an accident (reported anyway) and I see no evidence to support that it has. I've inspected the rear differential mount and other than being dried out and rotted (I was planning on replacing anyway) it all looks fine to me. I've inspected all mounting areas on the entire subframe to see if I can see any wrinkle in the body or some kind of evidence of paint stress and I can't find a thing. All the differential mounts look fine too. The vehicle tracks perfectly as far as I remember. I did follow the wife in another vehicle and I didn't notice any problem.

The stress (stretched part) is toward the front of the car. That would mean that the subframe would have had to slide toward the back of the car which seems almost impossible to me. How in the world could the subframe move toward the back of the car in some kind of collision? Pushed to the front by rear impact maybe, but to the back?

I do have another theory. What I suspect is that the vehicle was towed incorrectly. My guess is some jerk attached cables to the trailing arms and pulled it up on a flatbed truck. Nothing else that I can think of makes sense otherwise. If the damage was on the back of the subframe then I could imagine a rear collision of some kind, but damage in the front? Just doesn't make sense.

I think what I'll do is drop the differential and pull out the entire subframe and do a real good inspection. I'll take some measurements and check for square. If I can't find anything else wrong with it I'll straighten this out with a pin and maybe some heat. I'm hoping the passenger side has the same exact thing. This would at least help confirm my theory. Either way I know I need to yank it all out and have a real good look at it.

Later,
-Tony-