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Transmission has never been touched: original fluid, filter, etc.How often have you serviced the transmission?
More than 336k?I'm curious as to how long you think a transmission is supposed to last without being serviced? It has been running for the last 12 years....
UPDATE:
Purchased a new dipstick and plug from local Ford dealer. After having the engine off for a few minutes, I started to remove the old plug and broken dipstick. As I was loosening the bolt, transmission fluid begun to seep out and I tightened it back up and waited for the fluid to cool down and contract. I was then able to get the bolt off without liquid coming out. Since the engine was off for about 15 minutes, I checked the transmission fluid level with the new dipstick and the entire dipstick was covered in liquid - up to the end of the dipstick where it makes contact and rests on the transmission case.
Since you are supposed to check the level at operating temperature and while the engine is at idle, how is it possible for the fluid level to basically overflow a few minutes after the engine is off with a transmission that has never been serviced?
I believe that when the main transmission pump is operating (engine on), that the pan fluid level drops somewhat, due to the fluid being pumped through the transmission. When the engine is shut-off, the pan fluid level increases as the fluid flows back to the pan.