Automatic Transmission Torque Converter problems of the 2002 Mercury Sable

I have just found out from my mechanic that the transmission, ax4n, that is in my Mercury, have sudden and immediate failures due to a defect in the torque converter. When I called several local transmission shops, they are all aware of this problem. Cost to fix, approximately $1800 for a new torque converter. While you are driving the car it will act like you shifted into neutral. The engine is running, but the car will not move forward or backward. You immediately have to find a place to pull over to. This can be quite hazardous if you are on the expressway. There is no preventive maintenance you can do to prevent this problem. This is a manufacturing defect. The hydraulic pump shaft has approximately two inches of mail spline. The female counterpart which is in the torque converter is approximately one eighth of an inch in thickness. The hydraulic pump shaft will strip the teeth on the torque converter. This causes the car to become inoperable. What is frustrating is that you will have no warning when this will happen. And you do not have any warning of an impending problem. You are now looking at a $1800, for a replacement torque converter. The rebuild company that sells rebuilt torque converters replaces the 1/8 inch female spline,that has stripped, in the torque converter with a new 1/4 inch thick female spline in the torque converter. It certainly seems that Ford was negligent when assembling this transmission. This is a safety issue. My car can loose power at any time. When making a left turn into oncoming traffic or on the road while traveling on the expressway. I now have to drive this car and be paranoid while on the road. There is nothing I can do to prevent this problem. I would have to replace the torque converter for peace of mind while driving this car. It only has 69,000 miles on it. Ford said my car is out of warranty. Sincerely ralph e. Maclean.