The engine in these things are amazing! the Trans... if it hasn't gone, it will soon.
Direct from a Ford tech's mouth, that was the advice given when we were shopping it came down to a 125k Expy, a 140k Expy or a 170k Excursion. He said the 125k Expy would give us the longest life before we had to replace, the 140's saving grace was the 4.6, we might get another 10k before it became a time bomb, and he said the Excursion had past its "use by" date, as far as Trans replacement went.
Sure as shootin' told the wife between 130-140 it would go Tango Uniform, and at 135 started to get funny, by 139 it was borrowed time, and it quit moving under its own power at 140275.
Good chance that has been replaced, and you are fine, but I would check that out first.. Slightly more expensive than an alternator or water pump, if you know what I mean.