These are frequently asked for part numbers:(Prices given are typical dealer prices)Parts for Accumulator Piston Repair for 1993 to 1997 Mark VIII's:F7AZ-7F251-AA updated 1-2 accumulator piston $12.00F75Z-7F284-AA upper/top (light blue) spring $3.25F7AZ-7F284-BA lower/bottom (purple) spring $32.50F4AZ-7F247-A 1&2 cover & seal $3.42If your Mark VIII (1993 to mid year 1997) shifts hard or shudders into 2nd gear you may have a problem with the 1-2 shift accumulator in the transmission. The piston rocks in the bore and damages the O-ring causing erratic 1-2 shifts. It is a simple job if you are changing the filter. All you need to change the piston after you remove the pan is a snap ring pliers. It is recommended that you replace the piston and spring in the transmission when you service it. The new piston has a totally different design and the O-ring are thicker. The top spring is taller than the original. Use Mercon V when servicing the transmission and make sure that the torque converter is drained. There is a dust cover on the bottom of the bell housing. You have to spin the motor over until you can access the small drain plug. You will replace about 12 quarts of transmission fluid. Use Mercon V fluid only, do not use older formulations. It is not necessary to replace the pan gasket, it is reusable.The above simple inexpensive repair is advisable as preventative maintenance even if you are not experiencing a shifting problem at this time. for more deatiled instuctions see the 1-2 accumulator paper.It is easy to tell if you have the old or new piston in your transmission by their appearance.
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