Interesting thoughts and observations on OD transmissions

In my specific situation I have a 42RH Dodge transmission in my Dart, and have had it in there for 6 or so years and it has been flawless.

Recently I have an issue where it doesn’t stay in converter lockup consistently.
It will drop out and re engage randomly.
My setup is fully automatic using governor pressure to determine shift points using adjustable pressure switches.
The lockup normally engages at about 65mph, and disengages when under 65 if the switch inside the cabin is in the Auto position.

I used a jumper wire to bypass the adjustable pressure switch to start diagnosing the intermittent on/off of converter lockup, then go to the relay that actually switches it if needed.
The question was, is the problem the pressure switch, the relay, or the solenoid inside the trans?
Well, bypassing the pressure switch solved the problem and in that process made lockup totally manual depending on the switch inside the car. (Which I expected)
Of course the problem is the most expensive part of the shifting system.
Those pressure switches ain't cheep.
I hardly use lockup except for extended 80mph and up drives, but it would be nice to have it all working as designed.

Anyway, here’s the interesting part.
I knew OD only works off the 3rd gear oil, meaning OD won’t engage unless the trans is already in 3rd gear.
Well during the lockup diagnosis I also found lockup will only engage once in 3rd.
With the pressure switch bypassed I can manually engage lockup at any speed I want as long as the trans is already in 3rd gear.
(Kinda fun to play with, but no practical use)

Now here’s the actual interesting thought based on how this trans works.
Imagine doing 80+ in OD with converter lockup and manually downshifting to second gear.
Converter lockup, OD and 3rd gear will all drop out at the same time.
Depending on the rear gears this could be a real problem.
I have a ratshit shifter, so this could easily happen accidentally.

Interesting.