Lincoln Zephyr Harsh or Delayed Shifting of Automatic Transmission

Was told by a lincoln service shop the car needs a new Valve Body. They say the diagnostic report came back without any codes. Problem began with the LED panel on the instrument cluster working intermittently. Then I noticed it sometimes didn't shift smoothly. Finally, there are sometimes clunking noises, and sometimes a different noise when turning. Other times the car drives fine. The care went from having a clean bill of health at 84K to all these problems at 90K. All regular maintenance and oil changes have been done and the car is not driven hard. I understand this is a known problem with Ford/Lincoln transmissions.

once in awhile at about 25-30 mph when i step harder on the gas to merge or change lanes the transmission shifts really hard scaring the heck out of me. I thought for sure something was broken. Took to the authorized Ford repair and they of course said there was nothing wrong. this has happened at least 6 - 10 times over 2 years, so far it is still drivable. I now have about 66,000 miles and hope i can sell it before it breaks.

noticed it after 24 hours of owning. we just try and baby the car.

Transmission shifts hard from park to drive, harsh and/or delayed down-shifts when passing, skips when driving in stop & go traffic. The dealer said there was no issue when last checked around 50k miles but did reset shift programming, which didn't solve the problem.