Gov is a possibility too. I'd have to think or rather look up how that interplays.
Did have the one in my heep come apart, and was able ot limp home home revving on low gear.
Put a hole in the case too.
Mine stuck on my 727 in my 74 charger. My first ever DIY rebuild, which I had to redo cause it stuck. But for me, it did the opposite, it banged the gears in HARD. So hard, it’d stall the car out