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Ok, For this, the first step is to construct a shift box.
Basically its a sheet metal or wooden box which will house 3 things: The manual valve body shifter, the gear1-3 shifter and the solenoid LEDs
With the OEM A604 Dynasty, you have a manual valvebody in the transmission. This is a valve with multipositions, which when manually turned- controls the route and direction from which fluid reaches the solenoid pack.
The OEM shifter uses a steel cable to shift the manual valvebody between "P, R, N, D, 3, L"
Interestingly, in total limp mode- or without a TCM at all, you *should* be able to drive around without using the selonoid pack so long the manual valvebody is working correctly.
At any rate, as you can see by the diagram above, the OEM shifter is simple.
The manual valve body shifter for the shift box is also simple. Picture a metal shaft with the cable attached to the top of it. Hinge the shaft to the bottom of the shift box and its mechanically done. When you move the shaft (shifter) its just like (in operation) the OEM shifter (only you are only shifting between P R N D)
Where the cable attaches to the shaft dictates how much the shaft needs to move to make a shift.
When done, it would be perhaps advantagious to put a LED or pilot lamp next to each position so that one can tell what the shifter is in at night.
This part is the simplest step involved with this mess.
This metal (rusty) bracket on a rotating shaft is the manual valve body.
The steel shifter cable attaches to the end of this bracket (not shown- wiring
connectors in the way).