OK, I've done a bunch more digging today - answered some questions but also created additional.
1. I think you're right on the 7060 A10 pin. Looking at the existing connector for the 7060: A10 is unpopulated but there is a brown wire at B11. So I think this should be mapped to F12 on the 7427. But is this correct since I have a 4wd and the service manual says it's for 2wd?
2. 7060, Pin B5. There is a light blue wire on existing B5 connector that I'm fairly certain goes to the rear sensor on the trans, along with the dark green/yellow wire at B6. (I will need to check with multimeter for continuity on esp. light blue wire - the color is faded and I'm not 100% sure it is the same wire that is on B5. If so does it seem correct that I have this mapped to F13 on the 7427?
3. 7060, Pin B6. There is a dark green/yellow wire at B6 that again I'm pretty sure goes to the rear sensor on the trans. So I agree this needs to be mapped to something on the 7427, but where. I have looked at all the available connections for the 7427 and it's not obvious where it should go? FSM lists B4 for 7427 as "Sensor Ground MAP, EGR, Transmission" Would it go here? (sorry if this is a dumb question)
4. A more general question. How does the 7427 know if the t-case is in 4-low? On the 7060, I presume it knows 4-low if it sees a difference between the output trans sensor and the t-case sensor. But on the later PCM, there was no rear trans sensor so I presume the 4-low input became a binary value, on or off? Where does that signal come from? Will I have to mimic it with my installation?
5. My t-case sensor has a purple/white wire and a green/black wire. I see that the purple/white goes directly to the DRAC, but is that where the green/black wire goes as well?
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