Governor would make more sense... specially those sticky Spitzer Governors...
I knew an old tranny guy that told me he used to take them out on a real sandy/dirt road [ so the tires would not have traction] and stick the tranny into Reverse at about 10 MPH..he swore that would free up a sticky one, but I never tried it..mainly cuz he was a Wack to begin with..but, he was a VET tranny guy.
I am limited on autos....