55 Tbird Fordomatic will not stay in gear

lgh

lgh

MI Red Bird
Last seen
Joined
Feb 27, 2019
Thunderbird Year
1955
Car will stay in park when it isn't running. Once started in neutral and shift into park it will not stay in park but goes into reverse. When in drive it will move to low and to neutral. It keeps moving around between the 3 gears when accelerating. It does not lock or stay in the selected gear. Do I replace the entire shifter or does something just need adjusted?
 

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