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Rotorwrench, As you noted, the governor drives off the final drive... so speed determines when the system is "live". The mystery deepens, because when I lift off the gas in 2nd gear, the OD engages at the proper speed... around 29 0r 30 mph (and stays engaged when I shift to third). However when I drive "normally", that is, take off in 1st, shift to 2nd, then shift to 3rd, then lift off the gas, it will not (ever) engage overdrive until I'm over 40 mph. I know it shouldn't work this way, but it does.
Perhaps the governor is working as it should, and there's something else in the OD circuit affecting 3rd gear engagement of the OD, but darn'd if I can figure out what it is.