Hi Don,

Nice illustration of the overdrive. It doesn’t show all the gears or a quantities legend.
I guess this is where a parts fiche would fill in questions better.
I bet that’s an exclusive purchase as I have never seen one except with dealerships.

I have never taken one of these apart but I shall someday get to experience an education and challenge to keep organized.

I see thin thin plate (40) that both gaskets (78)-(80) fit around now.
The thickness of those might be crucial or not. Part numbers might have a storyline in relation to years of production.

I was recalling the clutch cone from previous illustrations. The (53?) part is like the drum that houses the internal gearing that fits into (69) making up a planetary gears system.
The pistons look to push (41) back against the drums outer taper.
There looks to be return springs (49) involved but how many? One for each piston?

Does it use a friction material someplace or is it metal to metal tapers.
If it Is it there it must be part of (53) outsides or in the inside of (41)?
Whatever way something is being used my Overdrives have lasted a long long time! At 350k for me is impressive performance. I’m not abusive as I drive machines accordingly to their intended design.

I think on one of my units I need some fresh piston O rings as the temperature of the transmission fluid affects moments of operating smoothly to engage.
They have got to be old and harder by now.

Again, I’m familiar with my J types only. I have no idea of a P type or if it uses a hydraulic engagement unit affair before the J.
The M45’s still were only a four speed and Japanese cars had fives speeds as a standardization leaving domestic USA vehicles in the dust back then.

Phil