Forgive me as I'm not too familiar with the push buttons. But there's essentially 3 possible failure points:
- Maybe the actuator is either not reaching R or overshooting R.
- Maybe the actuator goes to the right place electrically, but there is misalignment between the actuator and lever. Or something is loose in that area.
- Sometimes the set screw holding the linkage on the inside loosens up and causes all kinds of annoyances. I actually just made a video on this just the other day.
https://youtube.com/shorts/8VWbsWP6gmA?si=QEPHdjAUHoRN6r6W The system in your car was rebuilt some years ago (I believe the electric part only) so I would expect/hope it is one of the latter two bullets as those are pretty easy to fix. You just have to be able to lift the car. That being said, I would start by checking the first bullet by doing the "electrical tests" section on p. 118 of the 55-56 Ultramatic manual. You only need a test light or voltmeter and don't need to lift the car.
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