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The tranny can be rebuilt to take the abuse. Not many performance cars have trannies that won't fail sooner or later.
No, I have not. There is nothing wrong the with transmission. But it was not designed for drag racing, and since that seems to be done with it a lot, failures are to be expected. Like for most sports sedans, the transmission was designed for fast rather than quick. Hopefully you understand the difference.
The only reason some see the AXN4 as a weakness is because they are using it beyond its design intent. Mine is at 170K with not a burble. But I have taken it to the drag strip exactly once, just to try it out.
Similarly, if you read up, you will find lots of reports of very high milage AXN4s out there, and their owners will pretty uniformly indicate they drive the car as a sports car, not a street light racer.
A few years ago I did a count and the low miles failures (under 50K) came in at less than the high miles (over 100k) reports with no problems from posts to V8SHO.
Your initial failure would not have made it to my low distance numbers. I think perhaps you need to look into a lot more vehicles and and specific automatic transmissions to get a feel for when they first start to show up problems.
Perhaps you find it normal wear and tear for a tranny to fail at 70K miles but I do not. The 40K mile failure is an even bigger slap in the face.
A transmission that needs a rebuild is not worn out, it just needs a rebuild.
But like I say, if it makes you feel better to think that Ford is out to get you, hey, go for it.