4l60E manual shift
If your plan is to shift it manually with the shifter, Simple 1 ground solenoid A then you only need to ground sol B with a switch of some sort in manual 1 so either directly as many have done with no issues use the M1 switch in the pressure manifold to ground sol B ON MANUAL 1 or you can do it via a relay and that terminal on the pressure switch or even an SCR. The rest of the gears will work out hydraulically with the shifter. Now I would suggest some sort of pressure control such as the transgo 46MOD'
And of course you will want lockup, This can be done by a simple switch that powers on the TCC and the PWM SOL or you could if you set up like a 3 sec delay allow it to lock with the 4th gear pressure switch (definitely with an SCR or RELAY) two sols would certainly be to much for the little switches in the manifold..This way you could pass D4 without engaging the TCC every time on the way down.
Now if you wanna do it in D4 position a bit more complicated. You would need a paddle for each gear you want to create or some logic circuit to create it with each paddle push.
But even in that set up I strongly suggest setting up pressure control .
Sorry I am not real fluent with Paddle shifter set up.






