This article is from the Chrysler-Plymouth-Dodge FAQ, by Dr. David Zatz with numerous contributions by others.
(Blair Wetmore)'s dealer reprogrammed the 4-speed
transmission's computer to cure the shudder when the torque converter locked up
under light throttle. Downshifts at low speeds are much better.
(Vincent Paul) notes that there is a TSB on other four-speed
automatic transmission shudders and mis-shifts.