Delmar is correct on how the torque converter allows slippage when slowing down. IIRC the component is called a "torque converter soleniod" located inside of the transmission. I believe one just has to remove the transmission pan and r&r the solenoid. Call around a few tranny shops and feel them out. Does it feel like you are driving an MT and trying to come to a stop in 4th gear?

1995 Mercury Mystique LS OBD1 2.5 L Duratec ATX- No modifications 70,000 Miles w/ O.E. Water Pump or Replaced: VSS, Lower speedo-cable(2X) Use: Mobil 1 5w30 and Techron Fuel Treatment.;) and Mobil 1 ATF Change every 10,000 miles