The governor-activated pressure switch should only affect response of the "
P", "
R", and "
N" buttons - even when it fails. If the "
D", "
H" or "
L" buttons are unresponsive, that
might rule out the pressure switch as a problem
Also, the start relay should prevent operation of the starter motor if any button other than "
P" or "
N" is selected. Odd, then, that the car started in reverse.
With only this much info, I'm thinking this car may have a wiring problem. If so,
MrPushbutton can certainly help with that.
Until we hear from him, you want to download the
Auto-Lite Service Manual: Packard 'Push Button' Transmission Control, which
HH56 generously contributed; it has some extensive diagnostic info. In fact, I noted it as "recommended reading" in the
Model Info pages for all 1956 cars.
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