Difference between Manual and auto shift valve body

Should also mention;
Back in the 80s, TransGo made a kit, that was either/or.It had a plate on the valve body that could be flipped. One way it was manual shift only. The other way was normal but still had all the shift quality the rest of the kit was engineered for.
It was kinda neat, cause when I got sickNtired of the manual shift, the option was just a flip away.Of course it never went back again.
Dont know if they still make it.