Much appreciated all, thank you !

Has the switch you mentioned first, a simple N.O. DPST.
Simple to service, just be cautious of bending the tabs and be certain to unsolder the top contact from the case before opening

Many thanks to you for all the explanation of this OD. Learning a lot, my plan is to take all this info and the two manuals I have and generate a logical schematic.
OD works, did have that problem where it didn't and w/o schematics, plodded through the wires and switches and found the OD switch wasn't working, took it apart (CAUTION to anyone that tries, the 4 metal tabs break easily and the contact near the top is soldered in, se need to be unsoldered before opening). I found a dirty contact and carefully burnished it. Then I found the relay wasn't working and took it apart. at one time, it had a lot of water and everything was corroded. Cleaned it up and all works fine now

Certainly you guys are all providing truthful information, just trying to figure out exactly what I have here and how it works.
The part of the puzzle that is missing is how does the solenoid get its hold in power

OK, I agree with most of what you are saying here.

If what you state is accurate, how does the hold-in coil get energized? Per the manual, the hold in coil is used to hold the pawl engaged in the secondary gear plate. Interesting, a few pages later, the manual states that the Hold-In coil is energized ONLY while moving the solenoid pawl in to the stationary gear plate. The purpose of the pull in coil is to assist the hold-in coil while the solenoid is engaging.
Pull in circuit OPENS when the solenoid plunger has traveled the distance and opens a set of contacts internally

The solenoid spring pulls the plunger (hence pawl) out, disengaging the OD

Per the manuals, the OD kicks in when torque on the OD is momentarily removed from the engine when letting off on the accelerator

So still getting back to my initial quandary, what activates the pull in / hold in solenoid initially?

Howard, I do not agree with this or do not understand your comment.
If what you state is correct, I'm cruising along at 30 mph and need to mash the throttle to the floor to activate OD? Foot to the floor deactivates and makes sense, but not to activate it. I do not have the reverse switch on this model

I activate OD by momentarily letting up on the throttle, hear a satisfactory "clunk" as the pawl engages the planetary gear OD and resume driving in OD

Again, thanks for the input!

I agree a lot of the drawings depict black boxes. I had to repair the OD kick down switch and relay so know what is in side them. I think I may FINALLY understand how this works.
In the dwg in post 22, the "boxes" depict contact points within the OD solenoid.
If that is correct, the HOLD in solenoid is always on with the ignition and when the governor is at proper speed and torque removed from the OD by letting off on the throttle momentarily, the pawl engages the planetary gear overdrive.
Either the early 39's were built this way, which logically does not make sense to me (why have a solenoid always active with ignition on) or over the years, a switch in series with the hold in coil was removed from my car.
thanks for all the help everyone, think I have it correct now, if not please advise.
If this is correct, I suspect I do have the two coils reversed as after the rebuild and rewiring, I see a large current draw when the key is turned on, perhaps thru the wrong could in the OD

Thanks Ross
I must be really dense on this one. So you are saying the two coils are in parallel and when I hit the throttle, the coils are energized. I do not see that parallel wiring in the schematic. The kickdown switch is a N.O. DPST switch, and teh schematic shows the hold in going thru the switch to the ign coil and is activated only when the OD switch is engaged. . Where is that switch? Nothing on the carb linkage and their isn't any switches on the OD lock out cable. It goes down to a mechanical arm located on the right rear of the OD assembly

I understand all that, but what’s the purpose of the hold-in solenoid and how is it energized?

Howard, my question is either too simple or a dumb one.
Driving along, let up on throttle to engage OD, HOW and what kicks it in and what activates the hold in coil?

Thanks for your patience
John