Glad somebody finally brought up the "park trick". I'm guilty as charged and have seen it work more times than I care to think about. Trans tech showed me in my early years.
That is one of those "tech tips" you post, knowing that you will probably get beaten up over. Sorta like the old dumping water down the carb to get rid of cylinder carbon deposits - some people cringe at it, others swear by it.
Mike, as to the "rattling" of the governor - about 10MPH, toss in park for a quick one thousand one count, then back into a forward gear. Too fast and the pawl just skims over the teeth, too slow and it will engage and lock the tires.
