If you have a stuck governor, my tranny guy says you can throw the vehicle into park at about 20mph and the ratcheting action of the parking pawl skipping over the detents will jar the governor hard enough to sometimes free it up. I never had the balls to do this but his assistant said he did it to mine before deciding to disassemble it again(it didn't work that time).
I looked at all the pieces lying on the bench when it was apart and nothing looked damaged from doing that. IDK.